x+y=3,xy=-5,x2+y2=19,x2-xy+y2=24,求x-y
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x+y=3,xy=-5,x2+y2=19,x2-xy+y2=24,求x-y
x+y=3,xy=-5,x2+y2=19,x2-xy+y2=24,求x-y
x+y=3,xy=-5,x2+y2=19,x2-xy+y2=24,求x-y
x²+y²=19,
x²-2xy+y²=29
即(x-y)²=29
∴ x-y=±根号29
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