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1.87 9.9+0.187的简便运算

1.87*9.9+0.187 =1.87*9.9+1.87*0.1 =1.87*(9.9+0.1) =1.87*10 =18.7

1.87+9.9+0.187=1.87÷10+9.9x10+0.187=0.187+99十0.187=0.187x2十99=0.374+99=99.374

0.187(99+1)=18.7

18.7

应该是+0.187吧1.87*9.9+0.187=1.87*9.9+1.87*0.1=1.87*(9.9+0.1)=1.87*10=18.7

应该是1.87x9.9+0.187吧解:1.87x9.9+0.187=1.87x(10-0.1)+0.187=1.87x10-1.87x0.1+0.187=18.7-0.187+0.187=18.7

1.87*9.9+1.87=1.87*10-1.87*0.1+1.87=18.7-0.187+1.87乘法转换成加减法,后面你就会了.

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