五年级上册数学期末复习之简便计算专项
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简介
3.9÷(1.3×5) =3.9÷1.3÷5 =3÷5 =0.6 (7.7+1.54)÷0.7 =7.7÷0.7+1.54÷0.7 =11+2.2 =13.2 2.5×2.4 =25×4×0.6 =10×0.6 =6 0.35×1.25×2×0.8 =(0.35×2)×(1.25×0.8) =0.7×1 =0.7 32.4×0.9+0.1×32.4 =324×(0.9+0.1) =32.4×1 =32.4 12.7-(3.7+0.84) =12.7-3.7-0.84 =9-0.84 =8.14 15÷(0.15×0.4) =15÷0.15÷0.4 =100÷0.4 =250 3.12+3.12×99 =3.12×(1+99) =3.12×100 =312 7.6×0.8+0.2×7.6 =7.6×(0.8+0.2) =7.6×1 =7.6
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