(x+8)⼀(x+7)+(x+9)⼀(x+8)=(x+7)⼀(x+6)+(x+10)⼀(x+9).求x(为什麼)

2024-11-28 01:33:39
推荐回答(1个)
回答1:

通分太麻烦雀如枯了橡橘!
简便一点的方法:
解顷洞:
(x
7
1)/(x
7)-(x
6
1)/(x
6)=(x
9
1)/(x
9)-(x
8
1)/(x
8)
.
1
(1/x
7)-1-(1/x
6)=1
(1/x
9)-1-(1/x
8)
.
(x
7)*(x
6)=(x
9)*(x
8)
解方程得
x=-7.5