Question

【a的平方-4a+4分之（a+1）（a-2）减a的平方-2a分之a】除a-2分之a,帮我,

Answer 1

原式={(a+1)(a-2)/(a-2)²-a/[a(a-2)]}*(a-2)/a

=[(a+1)/(a-2)-1/(a-2)](a-2)/a

=(a+1-1)/a

=1