小数除法脱式运算简算260道含答案.doc

小数除法脱式运算+简算260道一计算题（共50小题）1用你喜欢的方法计算3212.50.25 6.14.2+5.86.1 1.72.50.4 16.14.25.83脱式计算4.8（1.20.5） 12.812.85 71.4（76）4用你喜欢的方法计算0.651010.65 12.63.25+6.756.350.20.5 5.71.219 1.253.630.85我能用喜欢的方法计算下面各题0.111.8+8.20.11 3.53.50.98 0.75180.15 0.254.7886能简算的要简算17.30.1258 14.720.7+5.280.73.50.56 8.59.9+0.827递等式计算，有简便运算的用简便方法38.75（24.5+8.75）0.42.320.250.751014.23.20.97.5699+7.5670.317.487.63.645.223.321.80.81.2545（5.250.25）16.510116.50.960.3141.2542.5836.45（0.82+3.40.2）9.072.640.41.510112.67.5+8.313.60.853.60.851048.586.46.40.40.256.20.4236.5+176.5360.40.25（24.618.1）3.47.69.9+7.60.113.60.812.523.98.53.98.5（2.55+9.616）0.429.20.2548脱式计算（能简算的要简算）0.7540.2549.6+9.99915.588.20.724.5360.8142.83.6+1.42.86.310.19脱式计算（能简算的要用简算）4.27.8+2.24.2 9.5101（83.82）1.25 0.125720.63.90.8 420.39+4.26.110脱式计算，能简算的要简算0.251.2516 18.918.91.4 8.371.28.370.2 4311.8+5.711811用简便方法计算6.2+5.18+2.8 15.35（5.35+7.2）3.631.25+17.378.75 51.728.661.3412脱式计算，能简算的要简算0.71010.7 0.1254.958 12.91.682.32 56720513用递等式计算，能简算的要简算 20.167.2+9.8 6.22.7+6.57.3 32.8+9.6+7.214脱式计算：能简算的要简算15.89（5.89+6.98）0.2513.70.432.728+7.328159.4424.9+12.875.380.050.7201.715计算下面各题，能简算的要简算5.0428（15.47.8）3.5 3.24.6+3.25.40.2517.44 206.723.28 8.33+7.45+1.67+2.5516脱式计算0.20.60.54 （7.52.30.4）0.011.20.25+2.80.25 178.8（26.45.6）17能简算的要简算3.61.28+3.09 3.82+2.9+0.18+9.1 9.43（6.281.57）21.32（6.32+8.3）13.75（3.75+6.48）157.352.6518混合运算，能简便就简便19.812.688.32 5.6+6.65.6+6.6 0.8127+0.1927 1010.190.1919用简便方法计算9.081.764.24 18.38（5.38+1.8）8.217.45（8.766.55） 12.87+3.983.8720脱式计算，能简便的用简便方法计算10.8（3.94+6.86）0.8 0.65201 12.53.90.839.80.254 37.68+37.62 0.7899+0.7821脱式计算：21.87.222.78 90.241.61.19.12+9.1296.02 45.266.7+66.753.8+66.70.250.80.1250.4 12.7514.6（1.3+8.2）0.12536（40.5）36（6.14.6）0.810.3615.6（4.1+0.2+6.860.7）5（11.20.8）410.25+0.40.6 13.6340.62 25.8+10.5（53.5）1.420.3660.649.50.22.07236.7+3.34.4+5.622计算下面各题（能简算的要简算）50（0.8+0.4） 7.342.1+7.346.8+7.341.120.51.250.8 9.889+9.8823计算下列各题（能用简便算法的要用简便算法）12.6（1.02+3.18） 5.76.9+4.36.9 （0.81+2.7）0.9 （8.47.9）0.251.225能简算的用简便方法计算（写出主要简便过程，无过程不得分）1.63.91.25 4.872.34+48.70.2660.499.9 0.050.7201.72.53.212.5 3.957.6+3.953.43.9526计算下面各题，能简算的要简算7.86.9+2.26.92.362.541020.454.1999+4.1921.360.812.93.20.80.2627计算（能简算的要简算） 6.331016.331.655.455.40.617.685.2+2.71.5（1.10.78）（2.71.95）35.651.73150.22.528脱式计算（能简算的要简算）2.51.370.44.80.25250.894.8+0.895.21010.78208.81.25154.30.8529计算下面各题，能简算的要简算44.280.94.10.250.3947.6+7.6999.0722.783.44.899+4.86.310.130下面各题，能简算的就要简算5.8+3.80.251.7（4.653.87）1.254.30.84.51020.541010.543.42.5+6.62.531计算下列各题0.45120.26.22.12.1 0.90.81002.82.80.15 2.81.43+0.57 720.81+10.3106.06+8.5 60.251.8 7.062.45.832用简便方法计算0.259.874 36.21.8+13.81.8 0.1252.380.73102 （6.8+2.6）5 0.239833能用简便方法的用简便方法计算12.5322.5 6.89.9 7.21.8（3.42.9）34用你喜欢的方法计算3.49+3.4 6.40.81.54 3.780.254 17（1.2+0.5）535用你喜欢的方法计算2.51.2580.4 12.81.7+87.21.7 1004.355.6536用递等式计算（能简算的要简算）4+7.615 26.080.254 19.7+（80.5350.2）37计算，能简算的要简算1.252.250.8 9.799+9.7 4.87.8+780.52 3.6510.138计算下面各题（能简算的用简便算法） 12.366.493.518.53.8+8.56.217.30.25815.321.853.461992.63.6（1.3+0.6）539计算8.5+6.856.35 3.9+0.13.9+0.1 12.6（3.75+5.08）40计算，能简算的要简算6.099.138.3 3.849.6+0.9661.6 4.86995.684+4.320.25 6.44.5+3.64.541脱式计算10.5+6118 （3.14+12.6）8 4.5（153） 75+44841942计算：（18.53.8+3.82.5）0.19 32（7.25+0.758）5043脱式计算，能简算的就简算：25.32（3.41.2） 120.624.3844用简便方法计算下面各题5.12+2.54+4.8812.517.80.8 0.240.4849.92.59.45.8+10.65.8 0.661014.80.25 2.330.54 1.32.5+0.72.51.260.6+1.260.4 1020.55 0.0340.50.245计算（怎样简便就怎么计算）13.38+0.98= 7.022.98 6.57（0.680.39+0.32）13.8（1.380.2） 30.70.1220.76 7.81.0118.46.5+1.6+3.5 7.80.6+7.80.4 12.13+7.51.13+2.85 0.1258.8 9.43.2+60.32 9.63.6+7.20.246计算下面各题，能简算得要简算96（1000.48） 3.6（1.2+0.5）6（96731）（17+48） 7210.1+2710.147用自己喜欢的方法计算3.47.83.9 54（6.86+3.94）48用简便方法计算0.486+0.01+3.99 17.52.37.52.3 1.251140.84.839+614.8 45.55（6.82+15.55）3.299+3.22.556+4.556 （31.611.7）2.54 3.60.9+3.60.149计算下列各题（能简算的要简算）7.52.40.82.5 12.517+8312.53992.5 25（2.50.4）3.2567+5.7567+67 2302.57.56.3+0.84+3.7+8.16 100（2.72+10.8）0.250脱式计算0.253.254 6.72+3.22.5 21.360.423.4 0.84.5+1.24.5小数除法脱式运算+简算260道参考答案与试题解析一计算题（共50小题）1【解答】解：（1）3212.50.25=4812.50.25=（40.25）（812.5）=1100=100（2）6.14.2+5.86.1=6.1（4.2+5.8）=6.110=61（3）1.72.50.4=1.7（2.50.4）=1.71=1.7（4）16.14.25.8=16.1（4.2+5.8）=16.110=6.12【解答】解：（1）（0.60.8+0.12）1.2=0.61.2=0.5答：商是0.5（2）（14.81+5.19）（14.815.19）=209.62=192.4答：积是192.4（3）（2.7+4.5）120.3=7.2120.3=0.60.3=0.18答：积是0.183【解答】解：4.8（1.20.5）=4.82.4=212.812.85=12.82.56=10.2471.4（76）=71.476=10.26=1.74【解答】解：0.651010.65 =0.65（1011）=0.65100=6512.63.25+6.75=12.6+（6.753.25）=12.6+3.5=16.16.350.20.5=6.35（0.20.5）=6.350.1=63.55.71.219 =5.7191.2=0.31.2=0.361.253.630.8=（1.250.8）3.63=13.63=3.635【解答】解：0.111.8+8.20.11=0.11（1.8+8.2）=0.1110=1.13.53.50.98=3.5（10.98）=3.50.02=0.070.75180.15=0.750.1518=518=900.254.788=0.2584.78=24.78=9.566【解答】解：17.30.1258 =17.3（0.1258）=17.31=17.3 14.720.7+5.280.7=（14.72+5.28）0.7=200.7=143.50.56 =（3.50.7）（0.560.7）=58=0.625 8.59.9+0.82=8.5（100.1）+0.82=8.5108.50.1+0.82=850.85+0.82=85（0.850.82）=850.03=84.977【解答】解：（1）38.75（24.5+8.75）=38.7524.58.75=38.758.7524.5=3024.5=5.5；（2）0.42.320.25=0.40.252.32=0.12.32=0.232；（3）0.75101=0.75（100+1）=0.75100+0.751=75+0.75=75.75；（4）4.23.20.9=4.22.88=1.32；（5）7.5699+7.56=7.56（99+1）=7.56100=756；（6）70.317.487.6=70.32.3=68；（7）3.645.223.3=0.723.3=16.31；（8）21.80.81.25=27.256=21.25；（9）45（5.250.25）=4521=；（10）16.510116.5=16.5（1011）=16.5100=1650；（11）0.960.314=3.214=44.8；（12）1.2542.58=（1.258）（42.5）=1010=100；（13）36.45（0.82+3.40.2）=36.45（0.82+0.68）=36.451.5=24.3；（14）9.072.640.4=9.076.6=2.47；（15）1.5101=1.5（100+1）=1.5100+1.51=150+1.5=151.5；（16）12.67.5+8.3=94.5+8.3=102.8；（17）13.60.853.60.85=（13.63.6）0.85=100.85=8.5；（18）1048.5=（100+4）8.5=1008.5+48.5=850+34=884；（19）86.46.40.4=13.50.4=13.1；（20）0.256.20.4=0.250.46.2=0.16.2=0.62；（21）236.5+176.5=（23+17）6.5=406.5=260；（22）360.40.25=900.25=22.5；（23）（24.618.1）3.4=6.53.4=22.1；（24）7.69.9+7.60.1=7.6（9.9+0.1）=7.610=76；（25）13.60.812.5=13.6（0.812.5）=13.610=136；（26）23.98.53.98.5=（23.93.9）8.5=208.5=170；（27）（2.55+9.616）0.42=（2.55+0.6）0.42=3.150.42=7.5；（28）9.20.254=9.2（0.254）=9.21=9.28【解答】解：（1）0.7540.254=（0.754）（0.254）=31=3（2）9.6+9.999=9.6+9.9（1001）=9.6+9.91009.9=9.6+9909.9=989.7（3）15.588.20.72=1.90.72=1.18（4）4.5360.814=5.6714=0.405（5）2.83.6+1.42.8=2.8（3.6+1.4）=2.85=14（6）6.310.1=6.3（10+0.1）=6.310+6.30.1=63+0.63=63.639【解答】解：（1）4.27.8+2.24.2 =4.2（7.8+2.2 ）=4.210=42（2）9.5101=9.5（100+1）=9.5100+9.5=950+9.5=959.5（3）（83.82）1.25 =（81.25）3.82=103.82=38.2（4）0.12572=0.12589=19=9（5）0.63.90.8 =2.340.8=1.872（6）420.39+4.26.1=420.39+420.61=42（0.39+0.61）=421=4210【解答】解：（1）0.251.2516=0.251.25（28）=（0.252）（1.258）=0.510=5（2）18.918.91.4=18.913.5=5.4（3）8.371.28.370.2=8.37（1.20.2）=8.371=8.37（4）4311.8+5.7118=4311.8+5711.8=（43+57）11.8=10011.8=118011【解答】解：（1）6.2+5.18+2.8 =6.2+2.8+5.18 =9+5.18=14.18 （2）15.35（5.35+7.2）=15.355.357.2=107.2=2.8（3）3.631.25+17.378.75=（3.63+17.37）（1.25+8.75）=2110=11 （4）51.728.661.34=51.72（8.66+1.34）=51.7210=41.7212【解答】解：（1）0.71010.7 =0.7（1011）=0.7100=70（2）0.1254.78=0.12584.7=14.7=4.7（3）12.91.682.32 =12.9（1.68+2.32）=12.94=8.9（4）567205=567（205）=567100=5.6713【解答】解：20.167.2+9.8 =2.8+9.8=12.6； 6.22.7+6.57.3 =16.74+47.45=64.19； 32.8+9.6+7.2=9.6+（32.8+7.2）=9.6+40=49.614【解答】解：（1）15.89（5.89+6.98）=15.895.896.98=106.98=3.02；（2）0.2513.70.4=0.250.413.7=0.113.7=1.37；（3）32.728+7.328 =（32.7+7.3）28=4028=1120；（4）159.442=14142=99；（5）4.9+12.875.38=17.775.38=12.39；（6）0.050.7201.7=0.05200.71.7=10.71.7=0.71.7=1.1915【解答】解：（1）5.0428=（5+0.04）28=528+0.0428=140+1.12=141.12；（2）（15.47.8）3.5 =7.63.5 =26.6；（3）3.24.6+3.25.4=3.2（4.6+5.4）=3.210=32；（4）0.2517.44=0.25417.4=117.4=17.4；（5）206.723.28=20（6.72+3.28）=2010=10；（6）8.33+7.45+1.67+2.55=8.33+1.67+7.45+2.55=（8.33+1.67）+（7.45+2.55）=10+10=2016【解答】解：（1）0.20.60.54 =（0.20.5）（0.64）=0.12.4=0.24； （2）（7.52.30.4）0.01=（7.50.92）0.01=6.580.01=658；（3）1.20.25+2.80.25 =（1.2+2.8）0.25=40.25=1； （4）178.8（26.45.6）=178.820.8=17【解答】解：（1）3.61.28+3.09=2.32+3.09=5.41（2）3.82+2.9+0.18+9.1 =（3.82+0.18）+（9.1+2.9）=4+12=16（3）9.43（6.281.57）=9.43+1.576.28=116.28=4.72（4）21.32（6.32+8.3）=21.326.328.3=158.3=6.7（5）13.75（3.75+6.48）=13.753.756.48=106.48=3.52（6）157.352.65=15（7.35+2.65）=1510=518【解答】解：19.812.688.32=19.81（2.68+8.32）=19.8111=8.815.6+6.65.6+6.6=（5.65.6）+（6.6+6.6）=0+13.2=13.20.8127+0.1927=27（0.81+0.19）=271=271010.190.19=（1011）0.19=1000.19=1919【解答】解：（1）9.081.764.24 =9.08（1.76+4.24）=9.086=3.08； （2）18.38（5.38+1.8）8.2=18.387.188.2=11.28.2=3；（3）17.45（8.766.55）=17.458.76+6.55=17.45+6.558.76=248.76=15.24；（4）12.87+3.983.87=12.873.87+3.98=9+3.98=12.9820【解答】解：10.8（3.94+6.86）0.8=10.810.80.8=10.8=0.80.65201 =0.65（200+1）=0.65200+0.651=130+0.65=130.6512.53.90.8=12.50.83.9=103.9=3939.80.254 =39.8（0.254）=39.81=39.837.68+37.62=37.6（8+2）=37.610=376 0.7899+0.78=0.78（99+1）=0.78100=7821【解答】解：（1）21.87.222.78=21.8（7.22+2.78）=21.810=11.8（2）90.241.61.1=90.151.1=90.165=8.835（3）9.12+9.1296.02=9.12（1+9）6.02=9.12106.02=91.26.02=85.18（4）45.266.7+66.753.8+66.7=（45.2+53.8+1）66.7=10066.7=6670（5）0.250.80.1250.4=（0.250.4）（0.1250.8）=0.10.1=0.01（6）12.7514.6（1.3+8.2）=12.7514.69.5=12.755.1=2.5（7）0.12536（40.5）36=0.125（40.5）（3636）=0.12581=1（8）（6.14.6）0.810.36=1.50.810.36=1.210.36=0.20.36=0.072（9）15.6（4.1+0.2+6.860.7）=15.6（4.1+0.2+9.8）=15.5（4.1+10）=15.514.1=1.4（10）5（11.20.8）4=5（10.96）4=50.044=4.964=1.24（11）10.25+0.40.6=4+0.24=4.24（12）13.6340.62=40.820.3=20.5（13）25.8+10.5（53.5）=25.8+10.51.5=25.8+7=32.8（14）1.420.3660.6=1.420.36=1.07（15）49.50.22.0723=9.90.09=9.81（16）6.7+3.34.4+5.6=6.7+0.75+5.6=7.45+5.6=13.0522【解答】解：50（0.8+0.4）=500.8+500.4=40+20=607.342.1+7.346.8+7.341.1=7.34（2.1+6.8+1.1）=7.3410=73.420.51.250.8=20.5（1.250.8）=20.51=20.5 9.889+9.88=9.88（9+1）=9.8810=98.823【解答】解：（1）12.6（1.02+3.18）=12.64.2=3；（2）5.76.9+4.36.9=（5.7+4.3）6.9=106.9=69； （3）（0.81+2.7）0.9=3.510.9=3.9；（4）（8.47.9）0.251.2=0.50.251.2=21.2=2.424【解答】解：（1）251.2532 =251.2584=（254）（1.258）=10010=1000（2）（+）35=35+35=10+7=17（3）78=（791）=79=3=2（4）+=25【解答】解：（1）1.63.91.25=0.823.91.25=（0.81.25）（23.9）=17.8=7.8（2）4.872.34+48.70.266=4.872.34+4.872.66=4.87（2.34+2.66）=4.875=24.35（3）0.499.9 =0.49（100.1）=0.49100.490.1=4.90.049=4.851（4）0.050.7201.7=（0.0520）（0.71.7）=11.19=1.19（5）2.53.212.5 =2.50.4812.5 =（2.50.4）（812.5）=1100=100（6）3.957.6+3.953.43.95=3.95（7.6+3.41）=3.9510=39.526【解答】解：（1）7.86.9+2.26.9=（7.8+2.2）6.9=106.9=69（2）2.362.54=2.36（2.54）=2.3610=23.6（3）1020.45=（100+2）0.45=1000.45+20.45=45+0.9=45.9（4）4.1999+4.19=4.19（99+1）=4.19100=419（5）21.360.812.9=26.712.9=13.8（6）3.20.80.26=40.26=1.0427【解答】解：（1）6.331016.33=6.33（1011）=6.33100=633；（2）1.655.455.40.6=（1.60.6）55.4=155.4=55.4；（3）17.685.2+2.71.5=3.4+4.05=7.45；（4）（1.10.78）（2.71.95）=0.320.75=0.24；（5）35.651.73=35.68.65=26.95；（6）150.22.5=15（0.22.5）=150.5=3028【解答】解：（1）2.51.370.4=2.50.41.37=11.37=1.37；（2）4.80.2525=（440.3）0.2525=（40.25）（425）0.3=11000.3=30；（3）0.894.8+0.895.2=0.89（4.8+5.2）=0.8910=8.9；（4）1010.7820=101（0.7820）=10115.6=（100+1）15.6=10015.6+115.6=1560+15.6=1575.6；（5）8.81.2515=（81.1）1.2515=（81.25）（1.115）=1016.5=165；（6）4.30.85=4.3（0.85）=4.34=17.229【解答】解：（1）44.280.94.1=49.24.1=12；（2）0.250.394=（0.254）0.39=10.39=0.39；（3）7.6+7.699=7.6（1+99）=7.6100=760；（4）9.0722.783.4=9.076.7=2.37；（5）4.899+4.8=4.8（99+1）=4.8100=480；（6）6.310.1=6.3（10+0.1）=6.310+6.30.1=63+0.63=63.6330【解答】解：（1）5.8+3.80.25=5.8+0.95=6.75（2）1.7（4.653.87）=1.70.78=1.326（3）1.254.30.8=1.250.84.3=14.3=4.3（4）4.5102=4.5（100+2）=4.5100+4.52=450+9=459（5）0.541010.54=0.54（1011）=0.54100=54（6）3.42.5+6.62.5=（3.4+6.6）2.5=102.5=2531【解答】解：0.45120.2=0.450.212=0.0912=1.086.22.12.1 =2.1（6.21）=2.15.2=10.92 0.90.8100=0.72100=722.82.80.15 =2.8（10.15）=2.80.85=2.38 2.81.43+0.57 =4.004+0.57=4.574720.81+10.3=58.32+10.3=68.62106.06+8.5=3.94+8.5=12.44 60.251.8 =1.51.8=2.77.062.45.8 =16.9445.8=11.14432【解答】解：（1）0.259.874 =0.2549.87=19.87=9.87；（2）36.21.8+13.81.8 =（36.2+13.8）1.8=501.8=90； （3）0.1252.38=0.12582.3=12.3=2.3；（4）0.73102 =0.73（100+2）=0.73100+0.732=73+1.46=74.46； （5）（6.8+2.6）5 =6.85+2.65=34+13=47； （6）0.2398=0.23（1002）=0.231000.232=230.46=22.5433【解答】解：（1）12.5322.5 =12.5482.5=（12.58）（2.54）=10010=1000； （2）6.89.9 =6.8（100.1）=6.8106.80.1=680.68=67.32； （3）7.21.8（3.42.9）=7.21.80.5=7.20.9=834【解答】解：（1）3.49+3.4=30.6+3.4=34；（2）6.40.81.54=86=2；（3）3.780.254=3.78（0.254）=3.781=3.78；（4）17（1.2+0.5）5=171.75=178.5=235【解答】解：（1）2.51.2580.4 =（2.50.4）（1.258）=110=10；（2）12.81.7+87.21.7 =（12.8+87.2）1.7=1001.7=170；（3）1004.355.65=100（4.35+5.65）=10010=9036【解答】解：（1）4+7.615 =4+114=118；（2）26.080.254=26.08（0.254）=26.081=26.08；（3）19.7+（80.5350.2）=19.7+（2.30.2）=19.7+0.46=20.1637【解答】解：（1）1.252.250.8=1.250.82.25=12.25=2.25；（2）9.799+9.7=9.7（99+1）=9.7100=970；（3）4.87.8+780.52=4.87.8+7.85.2=（4.8+5.2）7.8=107.8=78；（4）3.6510.1=3.65（10+0.1）=3.6510+3.650.1=36.5+0.365=36.86538【解答】解：12.366.493.51=12.36（6.49+3.51）=12.3610=2.36；8.53.8+8.56.2=8.5（3.8+6.2）=8.510=85；17.30.258=17.3（0.258）=17.32=34.6；15.321.853.46=15.3293.46=6.323.46=2.86；1992.6=（2001）2.6=2002.612.6=5202.6=517.4；3.6（1.3+0.6）5=3.61.95=3.69.5=39【解答】解：（1）8.5+6.856.35 =8.5+（6.856.35）=8.5+0.5=9；（2）3.9+0.13.9+0.1 =（3.93.9）+（0.1+0.1）=0+0.2=0.2；（3）12.6（3.75+5.08）=12.68.83=3.7740【解答】解：（1）6.099.138.3=6.091.1=4.99（2）3.849.6+0.9661.6 =（3.84+6.16）9.6=109.6=96（3）4.8699=4.86（1001）=4.861004.86=4864.86=481.14（4）5.684+4.320.25 =5.684+4.324=（5.68+4.32）4=104=40（5）6.44.5+3.64.5=（6.4+3.6）4.5=104.5=4541【解答】解：10.5+6118=10.5+1098=1108.5 （3.14+12.6）8=15.748=1.96754.5（153）=4.55=0.975+448419=75+11219=75+2128=220342【解答】解：（1）（18.53.8+3.82.5）0.19 =3.8（18.5+2.5）0.19 =3.8210.19=3.80.1921=20021=4200（2）32（7.25+0.758）50=32（7.25+6）50=3213.2550=18.7550=0.37543【解答】解：25.32（3.41.2）=25.322.2=23.12120.624.38=12（0.62+4.38）=125=744【解答】解：（1）5.12+2.54+4.88=5.12+4.88+2.54=10+2.54=12.54；（2）12.517.80.8=12.50.817.8=1017.8=178；（3）0.240.484=0.11524=0.4608；（4）9.92.5=（100.1）2.5=102.50.12.5=250.25=24.75；（5）9.45.8+10.65.8=（9.4+10.6）5.8=205.8=116；（6）0.66101=0.66（100+1）=0.66100+0.661=66+0.66=66.66；（7）4.80.25=（1.24）0.25=1.2（40.25）=1.21=1.2；（8）2.330.54 =2.33（0.54）=2.332=4.66；（9）1.32.5+0.72.5=（1.3+0.7）2.5=22.5=5；（10）1.260.6+1.260.4=1.26（0.6+0.4）=1.261=1.26；（11）1020.55=（100+2）0.55=1000.55+20.55=55+1.1=56.1；（12）0.0340.50.2=0.034（0.50.2）=0.0340.1=0.003445【解答】解：（1）13.38+0.98=13.38+（10.02）=13.38+10.02=14.380.02=14.36；（2）7.022.98 =7.02（30.02）=7.023+0.02 =4.02+0.02=4.04；（3）6.57（0.680.39+0.32）=6.57（0.68+0.320.39）=6.57（10.39）=6.570.61=5.96；（4）13.8（1.380.2）=13.81.380.2=100.2=50；（5）30.70.1220.76 =30.70.240.76=30.7（0.24+0.76）=30.71=29.7；（6）7.81.01=7.8（1+0.01）=7.81+7.80.01=7.8+0.078=7.878；（7）18.46.5+1.6+3.5 =（18.4+1.6）（6.53.5）=203=17； （8）7.80.6+7.80.4=13+19.5=32.5；（9）12.13+7.51.13+2.85=（12.131.13）+（7.5+2.85）=1110.35=0.65； （10）0.1258.8=0.125（8+0.8）=0.1258+0.1250.8=1+0.1=1.1；（11）9.43.2+60.32 =9.43.2+0.63.2=（9.4+0.6）3.2=103.2=32； （12）9.63.6+7.20.2=9.63.6+3.620.2=9.63.6+3.60.4=（9.6+0.4）3.6=103.6=3646【解答】解：（1）96（1000.48）=9648=2；（2）3.6（1.2+0.5）6=3.61.76=6=；（3）（96731）（17+48）=93665=14.4；（4）7210.1+2710.1=（72+27）10.1=9910.1=99（10+0.1）=9910+990.1=990+9.9=999.947【解答】解：（1）3.47.83.9=26.523.9=6.8；（2）54（3.94+6.86）=5410.8=548【解答】解：0.486+0.01+3.99 =0.486+（0.01+3.99）=0.486+4=4.486 17.52.37.52.3 =2.3（17.57.5）=2.310=23 1.251140.8=（1.250.8）（114）=144=444.839+614.8=4.8（39+61）=4.8100=480 45.55（6.82+15.55）=45.556.8215.55=45.5515.556.82=306.82=23.183.299+3.2=3.2（99+1）=3.2100=3202.556+4.556 =56（2.5+4.5）=567=392（31.611.7）2.54 =19.9（2.54）=19.910=1.993.60.9+3.60.1=3.6（0.9+0.1）=3.61=3.649【解答】解：（1）7.52.40.82.5 =7.532.5=7.57.5=0；（2）12.517+8312.5=12.5（17+83）=12.5100=1250；（3）3992.5 =（4001）2.5=4002.52.5=10002.5=997.25；（4）25（2.50.4）=252.50.4=100.4=4；（5）3.2567+5.7567+67 =（3.25+5.75+1）67=1067=670；（6）2302.57.5=927.5=690；（7）6.3+0.84+3.7+8.16=（6.3+3.7）+（0.84+8.16）=10+9=19；（8）100（2.72+10.8）0.2=10013.520.2=10067.6=32.450【解答】解：（1）0.253.254=0.2543.25=13.25=3.25（2）6.72+3.22.5=6.72+1.28=8（3）21.360.423.4=53.423.4=30（4）0.84.5+1.24.5=（0.8+1.2）4.5=24.5=9第25页（共25页）