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七点四九乘以九点九脱式计算用简便算法等于多少

7.49x9.9 =7.49x(10-0.1) =7.49x10-7.49x0.1 =74.9...

6.5*9.9=64.35

九点七减二点三九除九点三的脱式计算 九点七减二点三九除九点三 =9.7-2.39÷9.3 =9...

4.1-2.5+5.9-7.5 =(4.1+5.9)-(2.5+7.5) =10-10 =0 ...

18×0.92-3.93 =16.56-3.93 =12.63

0.82×9.9 =0.82×(10-0.1) =0.82×10-0.82×0.1 =8.2-...

1.015÷2.9+3.72 =0.35+3.72 =4.07

十点九乘5.4减9.8脱式计算 十点九乘5.4减9.8 =58.86-9.8 =49.06 ...

原式 =7.5-7.5x0.9 =7.5x1-7.5x0.9 =7.5x(1-0.9) =7...

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