先化简,再求值：（x分之x+2—x—2分之x—1）/x²—4x+4分之x—4,其中x是不等式3x+7>1的负整数解.

[（x+2)/x-(x-1)/(x-2)]/[(x-4)/(x^2-4x+4)]
=[(x+2)(x-2)-(X-1)x]*(x^2-4x+4)/[(x-4)x*(X-2)]
=(x^4-4-x^2+x)*(x-2)^2/[(x-2)x(x-4)]
=(x-4)*(x-2)^2/[(X-2)x(X-4)]
=(X-2)/x
3x+7>1
3x>-6
x>-2.所以x=-1.
代入上式子=(-1-2)/(-1)=3.