五年级数学上册《小数乘法》简便计算及口算练习题
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简介
1)8.2×99+8.2 =8.2×（99+1) =8.2×100 =820 2)8.8×12.5 =（8+0.8)×12.5 =100+10 =110 3)12.5×3.4×0.8 =12.5×0.8×3.4 =10×3.4 =34 4)0.78×9.9 =0.78×（10-0.1) =0.78×10-0.78×0.1 =7.8-0.078 =7.722 5)16×12.5×4.3 =2×8×12.5×4.3 =（2×4.3)×（8×12.5) =8.6×100 =860 6)0.34×101 =0.34×（100+1) =0.34×100+0.34 =34+0.34 =34.34
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