Quy đồng mẫu thức các phân thức: 2x/(x^2-1);-3x/(2x+2); 4/(x-1)
Giải thích
MTC:2.(x−1).(x+1)2xx2−1=2x(x−1).(x+1)=4x2.(x−1).(x+1)−3x2x+2=−3x2.(x+1)=−3x.(x−1)2.(x−1).(x+1)4x−1=8.(x+1)2.(x−1).(x+1)
MTC:2.(x−1).(x+1)2xx2−1=2x(x−1).(x+1)=4x2.(x−1).(x+1)−3x2x+2=−3x2.(x+1)=−3x.(x−1)2.(x−1).(x+1)4x−1=8.(x+1)2.(x−1).(x+1)