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12.5x8.7x0.8的简便计算

12.5x8.7x0.8 =(12.5x0.8)x8.7 =10x8.7 =87

12.5x0.7x0.8 =12.5×8×0.07 =100×0.07 =7

1.25x97十12.5x8.7 =1.25x(97+87) =1.25x(100+80 +6) =125 +100 +7.5 =232.2

原式 =12.5×0.8×73 =10×73 =730 满意采纳奥 还有疑问请追问

12.5x7.8+1.25 =1.25x(7.8+1) =1.25x(8+0.8) =10+1 =11

12.5X7.2 =12.5X0.8X9 =10X9 =90

=(0.39×20)÷(0.39×12.5) =20÷12.5 =(20×2)÷(12.5×2) =40÷25 =(40÷5)÷(25÷5) =8÷5 =1.6

l2·5x1.7xo.8 =(12.5x0.8)x1.7 =10x1.7 =17 请采纳正确答案,你们只提问,不采纳正确答案,回答都没有劲!谢谢管理员推荐采纳!! 朋友,请【采纳答案】,您的采纳是我答题的动力,如果没有明白,请追问。谢谢。

7.8-5x=12.8 解:5x=78-12.8 5x=-5 x=-1

2.8-5X=0.8 -5X=-2 X=0.4

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