[X-(1/5X+5)-(1/4x-7)]+(1/5X+5)+(1/5X+7)+1/8X=X最后答案等于X=40

[X-(1/5X+5)-(1/4x-7)]+(1/5X+5)+(1/5X+7)+1/8X=X最后答案等于X=40
[X-(1/5X+5)-(1/4x-7)]+(1/5X+5)+(1/5X+7)+1/8X=X
最后答案等于X=40

[X-(1/5X+5)-(1/4x-7)]+(1/5X+5)+(1/5X+7)+1/8X=X最后答案等于X=40
X-(1/5X+5)-(1/4x-7)+(1/5X+5)+(1/5X+7)+1/8X=X
X-(1/4x-7)+(1/5X+7)+1/8X=X
(1/5X+7)-(1/4x-7)+1/8X=0
x=-560/3

(x-(1/5x+5)-(1/4x-7))+(1/5x+5)+(1/5x+7)=x
x-(1/5x+5)-(1/4x-7)+(1/5x+5)+(1/5x+7)=x
-x/4+7+x/5+7=0
14=x/20
x=280

你题目抄错了吧，把40代进去验算不对啊

错误的方程吧？？

[X-(1/5X+5)-(1/4x-7)]+(1/5X+5)+(1/5X+7)+1/8X=X
[X-1/5X-5-1/4x+7]+1/5X+5+1/5X+7+1/8X=X
-5-1/4x+7+1/5X+5+7+1/8X=0
1/5X-1/4x+14+1/8X=0
3/40x+14=0
x=﹣560/3

X-1/5X-5-1/4X+7+1/5X+5+1/5X+7+1/8X=X (去括号）
X-1/5X-1/4X+1/5X+1/5X+1/8X-X=5-7-5-7 (移项、合并同类项）
-10/40X+8/40X+5/40X=-14
...

全部展开

X-1/5X-5-1/4X+7+1/5X+5+1/5X+7+1/8X=X (去括号）
X-1/5X-1/4X+1/5X+1/5X+1/8X-X=5-7-5-7 (移项、合并同类项）
-10/40X+8/40X+5/40X=-14
3/40X=-14
X=-560/3
你给的最后答案X=40，是错的，要不就是你提抄错了。

收起

道士摇头“你肯定是刚经历了

把括号里的都化出来，得
x-1/5X-5-1/4x+7+1/5X+5+1/5X+7+1/8X=x
把能消的消掉，得
1/5x+1/8X-1/4x=-17
两边同时乘最小公倍数40x，得
560x=-3
故x=-560/3

X-(1/5X+5)-(1/4x-7)]+(1/5X+5)+(1/5X+7)+1/8X=X
去掉括号以后就可以变为x-1/5x-5-1/4x+7+1/5x+5+1/5x+7+1/8x=x
将所有的x加起来就会变为x-1/5x-1/4x+1/5x+1/5x+1/8x+5+7-5+7=x =>
3/40x+5+7-5+7=0 =>
3/40x=-14 =>
x=-14*40/3
x=-186.67

[X-(1/5X+5)-(1/4x-7)]+(1/5X+5)+(1/5X+7)+1/8X=X
X-1/5X-5-1/4x+7+1/5X+5+1/5X+7+1/8X=X
-1/4x+1/5X+14+1/8X=0
3/40x+14=0
x=-560/3

题目错了

[X-(1/5X+5)-(1/4x-7)]+(1/5X+5)+(1/5X+7)+1/8X=X
X-1/5X-5-1/4x+7+1/5X+5+1/5X+7+1/8X=X
-1/4x+1/5X+14+1/8X=0
3/40x+14=0
x=-560/3
X=40？

[X-(1/5X+5)-(1/4x-7)]+(1/5X+5)+(1/5X+7)+1/8X=X
[X-1/5X-5-1/4x+7]+1/5X+5+1/5X+7+1/8X=X
-5-1/4x+7+1/5X+5+7+1/8X=0
1/5X-1/4x+14+1/8X=0
3/40x+14=0
x=﹣560/3

我也觉得答案是错的，