Toán Quy đồng mẫu thức nhiều phân thức: 2x/(x-y) ² ; 2y/x ²-y ² 14/07/2021 By Eden Quy đồng mẫu thức nhiều phân thức: 2x/(x-y) ² ; 2y/x ²-y ²
$\dfrac{2x}{(x-y)^2}=\dfrac{2x(x+y)^2}{(x-y)^2(x+y)^2}$ $\dfrac{2y}{x^2-y^2}=\dfrac{2y}{(x-y)(x+y)}=\dfrac{2y(x-y)(x+y)}{(x-y)^2(x+y)^2}$ Trả lời
$\dfrac{2x}{(x-y)^2.(x-y)(x+y)}=\dfrac{2x}{(x-y)^3(x+y)}$ $\dfrac{2y}{x^2-y^2}=\dfrac{2y}{(x-y)(x+y)}=\dfrac{2y(x-y)^2}{(x-y)^3(x+y)}$ Trả lời
$\dfrac{2x}{(x-y)^2}=\dfrac{2x(x+y)^2}{(x-y)^2(x+y)^2}$
$\dfrac{2y}{x^2-y^2}=\dfrac{2y}{(x-y)(x+y)}=\dfrac{2y(x-y)(x+y)}{(x-y)^2(x+y)^2}$
$\dfrac{2x}{(x-y)^2.(x-y)(x+y)}=\dfrac{2x}{(x-y)^3(x+y)}$
$\dfrac{2y}{x^2-y^2}=\dfrac{2y}{(x-y)(x+y)}=\dfrac{2y(x-y)^2}{(x-y)^3(x+y)}$