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(1.25+2.5)×0.8简便计算

(1.25+2.5)×0.8 =1.25x0.8+2x1.25x0.8 =1+2 =3 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。

分配律

(2.5×1.25)×0.8 =2.5×(1.25×0.8) =2.5×1 =2.5

(1.25+2.5)×0.8 =1.25×0.8+2.5×0.8 =1+2 =3 乘法结合律计算

1.25×2.5×(8+4) =1.25×2.5×8+1.25×2.5×4 = 1.25×8×2.5+ 2.5×4×1.25 = 10×2.5+10×1.25 = 25+12.5 = 37.5

(2.5+1.25)x4x0.8 =2.5x4x0.8+1.25x0.8x4 =10x0.8+1x4 =8+4 =12

1.25×2.5×0.8×40 =1.25×0.8×(2.5×40) =1x100 =100

1.25/(0.4+2.5X0.8) =1.25/(0.4+2) =125/240 =120/240+5/240 =1/2+1/48 =25/48

1.25*2.5*0.4*0,8 =(1.25*0.8)*(2.5*0.4) =1*1 =1 运用知识:乘法交换律、乘法结合律。

2.5×0.8×0.04×1.25 =(2.5×0.04)×(0.8×1.25) =0.1×1 =0.1

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