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数的运算四,1,.,松树30棵,杨树50棵,松树是杨树的百分之几? 杨树50棵,松树是杨树的60%,松树多少棵? 松树30棵,正好是杨树的60%,杨树多少棵?,2,什么叫出勤率? 出勤人数占应出勤人数的百分之几。 (903)90 =8790 0.967 =96.7%,96.7%,97.6%,96.9%,99.2%,98%,100%,3,“1”,(4235)35 =735 =20% (3530)35 =535 14.3%,“1”,(4230)42 =1242 28.6%,“1”,4,10000(5%10%) =100000.15 =1500(张) 10000(30%5%) =100000.25 =2500(张),5,(480408)480 72480 =15%,48048015% =48072 =408(页),“1”,“1”已知,“1”未知,九月份水电费节约的水电费=十月份的水电费 解:设九月份的水电费是元。 15%=408,6,一种电视机,原来每台售价2400元。降价25%后,每台售价多少元?一种电视机降价25%后,每台售价1800元。原来每台售价是多少元?,2400240025% =2400600 =1800(元),原价降价=现价 解:设原来每台售价元。,“1”已知,“1”未知,25%=18000.75=1800=2400,7,
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