已知X,Y满足x+y=4,x^2-y^2=20,求x,y的值

已知X,Y满足x+y=4,x^2-y^2=20,求x,y的值
已知X,Y满足x+y=4,x^2-y^2=20,求x,y的值

已知X,Y满足x+y=4,x^2-y^2=20,求x,y的值
x^2-y^2=20
(x+y)(x-y)=20
x+y=4
4(x-y)=20
所以 x-y=5
所以2x=9
2y=-1
所以
x=9/2,y=-1/2
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