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9.12乘以零点儿七二,加上零点儿912乘以二点儿八用简便方法计算

9.12×0.72+0.912×2.8 =9.12×0.72+9.12×0.28 =9.12×(

十二分之七加零点九乘九分之七 =7/12+9/10x7/9 =7/12+7/10 =35/60

计算计算 12.5x8.9x0.8 =(12.5x0.8)x8.9 =10x8.9 =89

采纳吧

59*2.5*0.4=59*1=59 12.5*88=12.5*(90-2)=12.5*90-12

0.25x3/12x3/26x4/9=1/4x4/9x3/12x3/26=1/9x9/312=1/3

采纳哦

9.8×65.2×1.25-12.5×0.65×18 =98×6.52×1.25-1.25×6.5

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