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12.8x(3.27一o.53)十4.2x13.7的简便方法

简便方法 12.8x(3.27一0.53)十4.2x13.7 =12.8x2.74十4.2x13.7 =12.8x27.4十2.1x27.4 =(12.8+2.1)×27.4 =14.9×27.4 =408.26

12.8x3.7一6.5x3.7 =(12.8一6.5)x3.7 =6.3x3.7 =23.31

12x十8x=80 (12+8)x=80 20x=80 x=80÷20 x=4

=8*125+8*12 =1000+96 =1096

30.8x12.6-30.8x2.6 =30.8×(12.6-2.6) =30.8×10 =308 你好,本题以解答,如果满意,请点右下角“采纳答案”,支持一下。

12×8-12=84 回答完毕~ 有疑问请追问,我一定尽快回复你~ 无疑问请点击【采纳】,同时预祝学习进步~\(^o^)/~ 我不是学霸,叫我赌神~\(^o^)/~~\(^o^)/~~\(^o^)/~~\(^o^)/~

12.8x3.7+12.8x6.3 =12.8x(3.7+6.3) =12.8×10 =128 谢谢,请采纳

12.8x0.5x0.2 =12.8x5x2÷100 =12.8x10÷100 =1.28

8X(125十12) =8X125十8X12 =1000+96 =1096

12.5x17.8x0.8 =12.5×0.8×17.8 =10×17.8 =178 乘法交换律

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