Thực hiện phép tính (1/x^2+x-2-x/x+1):(1/x+x-2)
Giải thích
1x2+x−2−xx+1:1x+x−2 DK:x≠0;x≠−1
=1xx+1−2−xx+1:1+x2−2xx
=1xx+1−x2−xxx+1:x−12x
=x2−2x+1xx+1:x−12x
=x−12xx+1:x−12x
=x−12xx+1.xx−12
=1x+1
1x2+x−2−xx+1:1x+x−2 DK:x≠0;x≠−1
=1xx+1−2−xx+1:1+x2−2xx
=1xx+1−x2−xxx+1:x−12x
=x2−2x+1xx+1:x−12x
=x−12xx+1:x−12x
=x−12xx+1.xx−12
=1x+1