解方程x²-xy-3x=0,x²+y+1=0
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解方程x²-xy-3x=0,x²+y+1=0
解方程x²-xy-3x=0,x²+y+1=0
解方程x²-xy-3x=0,x²+y+1=0
x²+y+1=0→y=-x²-1①
x²-xy-3x=0②
①代入②得,x²-x(-x²-1)-3x=0→x³+x²-2x=0→x(x²+x-2)=0→x(x-1)(x+2)=0
∴x=1或x=-2
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