作业帮x2+y2=7 xy+x+y=28求|x+y+1|的值
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x2+y2=7 xy+x+y=28求|x+y+1|的值
x2+y2=7 xy+x+y=28
求|x+y+1|的值
x2+y2=7 xy+x+y=28求|x+y+1|的值
(x+y+1)^2
=(x+y)^2+2(x+y)+1
=x^2+y^2+2xy+2(x+y)+1
=(x^2+y^2)+2(xy+x+y)+1
=7+2*28+1
=64;
|x+y+1|=8
x2+y2=7 xy+x+y=28求|x+y+1|的值
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