“y是x的系数”是什么意思啊?这类题的做法应该是将原式化成几个非负多项式之和为零的形式.单思你的意思看不懂.按照你的题目职能化成：(x+1)^2+(y+1)^2+(x+y)^2+2=0.是不是题目有问题?
4+2x+2y+3x^2+2xy+3y^2=0,y是x的系数,求x
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