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15十15X99怎样巧算

15十15X99 =15×(1+99) =15×100 =1500

1.15x99十99简便方法 =(1.15+1)x99 =2.25x(100-1) =225-2.25 =222.75

15.5x99十15.5 =15.5x(99十1) =15.5x100 =1550。

1.56+1.56x99 =1.56x(1+99) =156

15、9十15、9X99 =15.9×(1+99) =15.9×100 =1590

15x99+5用简便运算 =15×(100-1)+5 =15×100-15+5 =1500-10 =1490

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