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7.1x23用竖式计算,怎样算

6x127+71x2x3+12 =6x127+71x6+2x6 =6x(127+71+2) =6x200 =1200

2/7一1/14x2/7 =2/7×(1一1/14) =2/7×13/14 =13/49

1/(X-7)+1/(X-1)=1/(X-6)+1/(X-2) 1/(X-1)-1/(X-2)=1/(X-6)-1/(X-7) -1/(X-1)(X-2)=-1/(X-6)(X-7) (X-1)(X-2)=(X-6)(X-7) X^2 -3X+2=X^2 -13X+42 10X=40 X=4 经检验,X=4是方程的解 如果帮到您的话,可以好评吗?谢谢了!!!(右上角采纳

原式 =1x2x3(1+3+7)/[(1x3x5) (1+3+7)] =6/11

其实是12.25(l)*7.5(h)*3.25(w),再换算成CM直接乘以2.54就可以了,所以答案就是31.1CM(L)*19.05(H)*8.25(W)麻烦好评,谢谢

解:2.4+1.6x0.7-1.2 =2.4+1.12-1.2 =2.32 答:答案是2.32. 、

10.1x7.2-72 =1.01x72-72 =(1.01-1)x72 =0.01x72 =0.72

5.5x2.3+1.7x5.5 =5.5x(2.3+1.7) =5.5x4 =22 朋友,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!!! 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。

12.6x7.6x2.32➗1.9➗1.4➗2.9如何用简便计算? 12.6x7.6x2.32➗1.9➗1.4➗2.9 =(12.6÷4)*(7.6÷1.9)*(2.32÷2.9) =3.15*4*0.8 =10.08

7又1/2:1.2=2.5/x等式计算 解: 7又1/2:1.2=2.5/x 7.5x=1.2*2.5 7.5x=3 x=0.4

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