解分式方程:(x+1)⼀(x+2)+(x+6)⼀(x+7)=(x+2)⼀(x+3)+(x+5)⼀(x+6)

解分式方程:(x+1)/(x+2)+(x+6)/(x+7)=(x+2)/(x+3)+(x+5)/(x+6)
2025-05-14 14:58:41
推荐回答(4个)
回答(1):

(x+1)/(x+2)+(x+6)/(x+7)=(x+2)/(x+3)+(x+5)/(x+6)
1-1/(x+2)+1-1/(x+7)=1-1/(x+3)+1-1/(x+6)
-1/(x+2)-1/(x+7)=-1/(x+3)-1/(x+6)
1/(x+2)+1/(x+7)=1/(x+3)+1/(x+6)
1/(x+2)-1/(x+3)=1/(x+6)-1/(x+7)
(x+3-(x+2))/(x+2)(x+3)=(x+7-(x+6))/(x+6)(x+7)
1/(x+2)(x+3)=1/(x+6)(x+7)
(x+2)(x+3)=(x+6)(x+7)
x^2+5x+6=x^2+13x+42
8x=-36
x=-9/2

经检验,x=-9/2是方程的根。

回答(2):

x=-4.5

回答(3):

(x+1)/(x+2)+(x+6)/(x+7)=(x+2)/(x+3)+(x+5)/(x+6)
1-1/(x+2)+1-1/(x+7)=1-1/(x+3)+1-1/(x+6)
-1/(x+2)-1/(x+7)=-1/(x+3)-1/(x+6)
1/(x+2)+1/(x+7)=1/(x+3)+1/(x+6)
1/(x+2)-1/(x+3)=1/(x+6)-1/(x+7)
(x+3-(x+2))/(x+2)(x+3)=(x+7-(x+6))/(x+6)(x+7)
1/(x+2)(x+3)=1/(x+6)(x+7)
(x+2)(x+3)=(x+6)(x+7)
x^2+5x+6=x^2+13x+42
8x=-36
x=-9/2

经检验,x=-9/2是方程的根。
这么简单都不会

回答(4):

(x+1)/(x+2)+(x+6)/(x+7)=(x+5)/(x+6)+(x+2)/(x+3)
化为:1-1/(x+2)+1-1/(x+7)=1-1/(x+6)+1-1/(x+3)
即:1/(x+2)-1/(x+3)=1/(x+6)-1/(x+7)
1/[(x+2)(x+3)]=1/[(x+6)(x+7)]
(x+2)(x+3)=(x+6)(x+7)
展开为:x²+5x+6=x²+13x+42
解得:x=-9/2=4.5