x^2+xy+x=36,y^2+xy+y=20,求x+y.
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x^2+xy+x=36,y^2+xy+y=20,求x+y.x^2+xy+x=36,y^2+xy+y=20,求x+y.x^2+xy+x=36,y^2+xy+y=20,求x+y.7或者-8∵x²
x^2+xy+x=36,y^2+xy+y=20,求x+y.
x^2+xy+x=36,y^2+xy+y=20,求x+y.
x^2+xy+x=36,y^2+xy+y=20,求x+y.
7或者-8
∵x²+xy+x=36①
y²+xy+y=20②
∴①+②得：
x²+xy+x+y²+xy+y
=(x+y)²+(x+y)
=56
∴(x+y)²+(x+y)-56=0
[(x+y)+8][(x+y)-7]=0
∴x+y=-8或x+y=7
x^2+xy+x=36 ①
y^2+xy+y=20 ②
用①+②，得：
x^2+xy+x+y^2+xy+y=36+20
整理，得：
x^2+2xy+y^2+x+y=56
(x+y)^2+(x+y)=56
把(x+y)用 z 替换：
z^2+z-56=0
z1= -8 z2=7
x+y=-8, x+y=7
求采纳啊
(x+y)^2+x+y-56=0
(x+y+8)*(x+y-7)=0
x+y=-8
x+y=7
x^2+xy+x=36,y^2+xy+y=20,求x+y.
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