x+y=1 解2x+3xy+y^2=5
2个回答
2x^2+3xy+y^2=5
(2x+y)(x+y)=5
2x+y=5 (1)
x+y=1 (2)
(1)-(2)
x=4 y=1-x=1-4=-3
x=4 y=-3
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