已知x^2+xy=2,y+xy=5,求x^2+2xy+y^2的值.

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已知x^2+xy=2,y+xy=5,求x^2+2xy+y^2的值.
已知x^2+xy=2,y+xy=5,求x^2+2xy+y^2的值.

已知x^2+xy=2,y+xy=5,求x^2+2xy+y^2的值.
应该是“已知x^2+xy=2,y² +xy=5,求x^2+2xy+y^2的值.”吧?
如果是,则
∵x²+xy=2,①
y²+xy=5 ②
①+②,得
x²+2xy+y²=7

x^2+xy=2,y²+xy=5，
相加，得
x^2+2xy+y^2=2+5=7

题中“y+xy=5”应为“y²+xy=5”
x²+xy=2
y²+xy=5
x²+2xy+y²=x²+xy+y²+xy=2+5=7

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