..(a²-4a+4)分之(2a-6)× (a²-3a)分之(a-2)- (a-2)分之1,其中a=

(a²-4a+4)分之(2a-6)× (a²-3a)分之(a-2)- (a-2)分之1
=(2a-6)/(a-2)²×(a-2)/a(a-3)-1/(a-2)
=2/a(a-2)-1/(a-2)
=(2-a)/a(a-2)
=-1/a;
=-1/(1/2)
=-2;
如果本题有什么不明白可以追问,