(x+3)/(x+2)+(x+4)/(x+3)=(x+5)/(x+4)+(x+2)/(x+1)
1+1/(x+2)+1+1/(x+3)=1+1/(x+4)+1+1/(x+1)
x+3+x+2/(x+2)(x+3)=x+1+x+4/(x+4)(x+1)
2x+5/(x+2)(x+3)=2x+5/(x+4)(x+1)
(1)2x+5不为0
(x+2)(x+3)=(x+4)(x+1)
x^2+5x+6=x^2+5x+4
方程无解
(2)2x+5=0 x=-5/2
为方程的解
(x+3)/(x+2)+(x+4)/(x+3)=(x+5)/(x+4)+(x+2)/(x+1)
1+1/(x+2)+1+1/(x+3)=1+1/(x+4)+1+1/(x+1)
(2x+5)÷((x+2)(x+3))-(2x+5)÷((x+1)(x+4))=0
1: 2x+5=0 x=-2.5
2: [(x+2)(x+3))-(x+1)(x+4)]/[(x+2)(x+3)(x+1)(x+4)]=0
-2/[(x+2)(x+3)(x+1)(x+4)]=0 此式无解
故x=-2.5
貌似无解,题错了吧