Toán 9 : Giải hệ phương trình

B

braga

$(1).y-(2)\iff 2y^3+xy^2-3xy-x^2-3y^2+2x+3y-1=0 \\ \iff (2y+x-1)(y^2-y-x+1)=0 \\ \implies \left\{\begin{matrix} 2y^2+x^2-3x+2xy=0(3) \\ y^2-y-x+1=0(4) \end{matrix}\right. \\ (3)-2.(4)\iff x^2+2xy-x+2y-2=0 \\ \iff (x+1)(2y+x-2)=0$
 
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