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八点八乘一点二五用简便的,脱式计算

8.8×1.25 =1.1×(8×1.25) =1.1×10 =11 或者: 8.8×1.25 =(8+0.8)×1.25 =8×1.25+0.8×1.25 =10+1 =11

=40×2.5×8.2 =100×8.2 =820

=7×(8×1.25) =7×10 =70 希望能帮到你,请采纳正确答案,点击【采纳答案】,谢谢 ^_^ 你的点赞或采纳是我继续帮助其他人的动力!

5.2×10.1 =5.2×10+5.2×0.1 =52+0.52 =52.52

原式 =1.6x7.5x1.25 =0.2x8x7.5x1.25 =(0.2x7.5)x(8x1.25) =1.5x10 =15

原式=7×0.8×0.125 =7×(0.8×0.125) =7×0.1 =0.7

5×289×2 =5×2×289 =10×289 =2890

括号里的20-1点二五×0点八括起来除以一点九脱式计算 解: (20-1.25×0.8)÷1.9 =(20-1)÷1.9 =19÷1.9 =10

化小数为分数: 2.2×8.5 =11/5×17/2 =187/10 =18.7。

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