5x^2+6xy+2y^2-14x-8y+10=0
3个回答
(1)整理成关于x的二次式:5x^2+(6y-10)x+(2y^2-8y+10)=0
计算x的判别式Δ/4=-y^2+10y-25>=0
得y=5从而可以算出x=-2
其他几道题可以用同样的方法求得
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