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简算:0.5x0.8x0.4x1.25x25

原式=(0.4×25)×(0.8×1.25) =10×1 =10

1.25x25x0.8x0.04 =(1.25x0.8)x(25x0.04) =1x1 =1 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。

1.25x(8+0.4)x25 = 1.25x8x25+1.25x0.4x25 =10x25+1.25x0.4x25 =250+1.25x10 =250+12.5 =262.5

1.25x25 =1.25x(20+5) =1.25x20+1.25x5 =25+6.25 =31.25 0.8x25 =0.2x(4x25) =0.2x100 =20

0.8x0.6x25简便计算 =25x0.4x(2x0.6) =10x1.2 =12

(12.5x0.54x1.4)(0.21x25x0.8) =(12.5x2x0.7x0.54)(0.21x25x4x0.2)=(25x0.7x0.54)(0.21x20)=17.5x0.54x4.2=35x2.1x0.54=73.5x0.54=39.69。

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