小学五年级奥数小数乘法简算.doc

小数乘法一1.312.5842.52.10.421.250.253212.50.642.50.1250.125x0.125x8x8xX80.250.25.x0.250.2544.x4405x0.80.41.2525下面有两个数，a等于0.000.0025,b等于0.000.08，试ab，b一a，axb。二1.62.64+1.66.36+1.60.8765.5+37.50.87-30.873.97.6+3924+396.21.11+26.2+6.26.894.26.7+6.71.2+3.35.43.10.75+0.756.2+9.30.258.632.3+7.75.21+3.427.75.721.8+0.75.72-2.51.72三9.96x1.43.69.99100.72.81.9830.23.65.4+7.22.33.7548+62.54.82.0167-1x0.6775x4.67+17.92.5四2.3+2.7+3.112.7+13.11.01+1.04+1.07+.+3.980.1+0.3+0.5+.+19.7+19.96.03+6.06+6.09+.+7.950.1+0.3+0.5+0.7+0.9+0.11+0.13+.+0.97+0.99五0.9+9.9+99.9+999.9+9999.9+99999.9，的整数部分0.9+0.99+0.999+0.9999+0.99999的整数部分设a等于0.1+0.1+0.11，0.11.11的整数部分求，1.3456十1.4563十1.5634十1.6345的整数部分1.07+1.007+1.0007.+1.000.007的整数部分设a等于0.2+0.22+0.222+.+0.222.2求a的整数部分。求0.81x0.6+0.820.6.+0.970.6+0.990.6的整数部分a等于8.28+8.98+8.998+8.9998+8.99998，a的整数部分是多少？