Cho biểu thức: A=(x/x-2+3x-2/2x-x^2):(x+2/x+4-x/x-2) a) Rút gọn A.

A=xx−2+3x−22x−x2:x+2x+4−xx−2DK:x≠0;x≠2

=xx−2+3x−2x2−x:x+2x+4−xx−2

=x2xx−2−3x−2xx−2:x+2x−2xx−2+4−xxxx−2

=x2−3x+2xx−2:x2−4+4x−x2xx−2

=x−2x−1xx−2:4x−1xx−2

=x−2x−1xx−2.xx−24x−1

=x−24