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用简便方法计算48×9.9

48×9.9 =48×(10-0.1) =48×10-48×0.1 =480-4.8 =475.2

48*125*9 =(6*8)*125*9 =(8*125)*(6*9) =1000*54 =54000

9.98×9.9=9.98×(10-0.1)=9.98×10-9.98×0.1=99.8-0.998=98.802 一、简便方法归类: 1、带符号搬家法(根据:加法交换律和乘法交换率) 当一个计算题只有同一级运算(只有乘除或只有加减运算)又没有括号时,我们可以“带 符号搬家”。 (a+b+c=a+c+b...

9.98×9.9 =9.98×(10-0.1) =9.98×10-9.98×0.1 =99.8-0.998 =98.802 满意请采纳。

48*(10-0.1)=48*10-48*0.1=480-4.8=475.2

45×9+9×450+5×9 =45×9+90×45+45×1 =45×(9+90+1) =45×100 =4500

①45×9.9 =45×(10-0.1) =45×10-45×0.1 =450-4.5 =445.5 ②4.82×88+48.2×1 =48.2×8.8+48.2×1 =48.2×(8.8+1) =48.2×9.8 =48.2×(10-0.2) =48.2×10-48.2×0.2 =482-9.64 =472.36 乘法分配律: 两个数的和同一个数相乘,等于把两个加数分别同这个数...

2.8×9.9 =2.8×10-2.8×0.1 =28-0.28 =27.72

答:原式=10+9.9+(10-0.01)x9 =10+9.9+90-0.09 =10+90+(9.9-0.09) =100+9.81 =109.81 希望能帮到你,望采纳

38×9/37 =(37+1)×9/37 =37×9/37+1×9/37 =9又9/37

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