Quy đồng mẫu thức các phân thức: 5/xy; 3b/(4x-6y); -a/(2x^2y-3xy^2)
Giải thích
MTC:2xy.(2x−3y)5xy=10.(2x−3y)2xy.(2x−3y)3b4x−6y=3b2.(2x−3y)=3bxy2xy.(2x−3y)−a2x2y−3xy2=−axy.(2x−3y)=−2a2xy.(2x−3y)
MTC:2xy.(2x−3y)5xy=10.(2x−3y)2xy.(2x−3y)3b4x−6y=3b2.(2x−3y)=3bxy2xy.(2x−3y)−a2x2y−3xy2=−axy.(2x−3y)=−2a2xy.(2x−3y)