两边乘(x+2)(x-2)
x²+3x+2+x²-3x+2=2x²-8
2x²+4=2x²-8
4=-8
无解
(x+1)/(x-2)+(x-1)/(x+2)=2
(x+1)(x+2)/[(x-2)(x+2)]+(x-1)(x-2)/[(x-2)(x+2)]=2
(x^2+3x+2)/[(x-2)(x+2)]+(x^2-3x+2)/[(x-2)(x+2)]=2
(x^2+3x+2+x^2-3x+2)/[(x-2)(x+2)]=2
2(x^2+2)/[(x-2)(x+2)]=2
(x^2+2)/(x^2-4)=1 分母不能为0
x^2+2=1
方程无解
x²+3x+2+x²-3x+2=2x²-8
2x²+4=2x²-8
4=-8
故方程无解
先分解公式:
可以得1+3/(X-2)+1-3/(X+2)=2 则
3/(X-2)-3/(X+2)=0。故X+2=X-2,无解
(X-2+3) /(x-2)+(x+2-3) /(x+2)
=x-2/x-2+3/x-2+x+2/x+2-3/x+2
=1+1
=2