五年级上册数学小数乘除法简便运算
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简介
7.5×0.8×1.25 =7.5×(0.8×1.25) =7.5×1 =7.5 4.9×5.5+4.9×4.5 =4.9×(5.5+4.5) =4.9×10 =49 0.25×(40+4) =0.25×40+0.25×4 =10+1 =11 5×0.7×4 =5×4×0.7 =10×0.7 =7 0.125×(80-8) =0.125×80-0.125×8 =10-1 =9 6.7×0.25×80 =6.7×(0.25×80) =6.7×20 =134
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