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12.7*1.2%2.7*1.2简便

12.7*1.2-2.7*1.2 =(12.7-2.7)*1.2 =10*1.2 =12

原式=6×7/12-6×1/2=7/2-6/2=1/2

7/12-1/2+1/4 =7/12-6/12+3/12 =4/12 =1/3

0.2+0.7+1.2+1.7+2.2+2.7+.....+12.7 =(0.2+12.7)×26÷2 =12.9×13 =167.7

0.12×7+1.2×0.3 =0.12x7+0.12x3 =0.12x(7+3) =0.12x10 =1.2

2.3十2.7十3.1十…十12.7十13.1 =(2.3+13.1)×28÷2 =15.4×14 =215.6

(3/4+1/2-7/12)×24 =3/4×24+1/2×24-7/12×24 =18+12-14 =16

7/12-1/2 =7/12-6/12 =1/12 =12分之1 朋友,请及时采纳正确答案,下次还可能帮到您哦,您采纳正确答案,您也可以得到财富值,谢谢。

3/7+1/2-3/7简便计算 =(3/7-3/7)+1/2 =1/2; 5/7-1/6+5/14简便计算7 =(10/14+5/14)-1/6 =15/14-1/6 =90/84-14/84 =76/84; =19/21; 7/12-(5/6-5/12)简便计算 =(7/12+5/12)-5/6 =1-5/6 =1/6; 2/3-1/2-1/18 =12/18-9/18-1/18 =2/18 =1/9; 2X-1/8=7...

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