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9.8×2.5怎样简便计算?

9.8×2.5 =2.5×(10-0.2) =2.5×10-2.5×0.2 =25-0.5 =24....

2.5×9.8 =2.5×10-2.5×0.2 =25-0.5 =24.5 扩展资料小数乘法的运算法...

问: 简便计算9.8×2.5。 答: 2.5×10-2.5×0.2 =25-0.5 =24...

9.8×25 =(10-0.2)×25 =10×25-0.2×25 =250-5 =245

9.8×2.5+2.02×8.5 =24.5+17.17 =41.67 ~回答完毕~ ~结果...

= (10+0.2)(10-0.2) = 10²-0.2² ...

9.8×65 =(10-0.2)×65 =10×65-0.2×65 =650-13 =637...

简便计算 6.3×9.8+63×2 =6.3x(10-0.2)+126 =6.3x10-6.3x0....

9.8+2.5-9.8+2.5 =(9.8-9.8)+(2.5+2.5) =0+5 =5

2.5×7.8÷3.9 =2.5×(7.8÷3.9) =2.5×2 =5

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