Cho P=(x+1/1-x-1-x/1+x-4x^2/x^2-1):4x^2-4/x^2-2x+1 .Rút gọn P
Giải thích
P=x+11−x−1−x1+x−4x2x2−1:4x2−4x2−2x+1DK:x≠±1
=−x+12x−1x+1+x−12x−1x+1−4x2x−1x+1:4x+1x−1x−12
=x−12−x+12−4x2x−1x+1:4x+1x−1
=−4x−4x2x−1x+1.x−14x+1
=−4xx+1x−1x+1.x−14x+1
=−xx+1
P=x+11−x−1−x1+x−4x2x2−1:4x2−4x2−2x+1DK:x≠±1
=−x+12x−1x+1+x−12x−1x+1−4x2x−1x+1:4x+1x−1x−12
=x−12−x+12−4x2x−1x+1:4x+1x−1
=−4x−4x2x−1x+1.x−14x+1
=−4xx+1x−1x+1.x−14x+1
=−xx+1