(x+y)^2=4,(x-y)=10,求x^2+y^2和xy的值

(x+y)^2=4,(x-y)=10,求x^2+y^2和xy的值
(x+y)^2=4,(x-y)=10,求x^2+y^2和xy的值

(x+y)^2=4,(x-y)=10,求x^2+y^2和xy的值
(x+y)^2=4
x-y=10
那么x+y=2或-2
当x+y=2时,与x-y=10得出x=6,y=-4
当x+y=-2时,与x-y=10得出x=4,y=-6
当x=6,y=-4时,x^2+y^2=52,xy=-24
当x=4,y=-6时,x^2+y^2=52,xy=-24

52,
-24

复制

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