Giải các phương trình sau : 1/(x-1)-2x^2/(x^3-1)=2x/(x^2+x+1), b. (x-1)/(x+1)-x/(x-2)=(5x-2)/(4-x^2)

1x−1−3x2x3−1=2xx2+x+1x≠1⇔x2+x+1−3x2x−1x2+x+1=2xx−1x−1x2+x+1⇒−2x2+x+1=2x2−2x⇔4x2−4x−1=0⇔4x2−4x+x−1=0⇔4xx−1+x−1=0⇔x−14x+1=0⇔x−1=04x+1=0⇔x=1(ktm)x=−14(tm)