toán 10 giai he phuong trinh

B

braga

$\text{HD:}$
$$\begin{array}
a 3x+y=(2x+1)\sqrt{x+y}\\
\iff (3x+y)^2=\left[(2x+1)\sqrt{x+y}\right]^2 \\
\iff 4x^3+4x^2y-5x-2xy+x+y-y^2=0\\
\iff (4x^2-x-y)(x+y-1)=0
\end{array}.$$
 
Top Bottom