Cho biểu thức A= ( x^3-1/ x-1+x)( x^3+1/ x+1 -x): x( 1-x^2)^2/ x^2-2 a) Rút gọn biểu thức A
Giải thích
a)x3−1x−1+xx3+1x+1−x:x1−x22x2−2=x2+2x+1x2−2x+1.x2−2x1−x21+x2=x+12x−12.x2−2x1−x21+x2=x2−2xb)x=6+22(tm)⇒A=6+22−26+22=22+23+2
a)x3−1x−1+xx3+1x+1−x:x1−x22x2−2=x2+2x+1x2−2x+1.x2−2x1−x21+x2=x+12x−12.x2−2x1−x21+x2=x2−2xb)x=6+22(tm)⇒A=6+22−26+22=22+23+2