x^2+y^2=10,x-y=4,求x,y x+y=-5,xy=4,求x-y x+y=9,xyx^2+y^2=10,x-y=4,求x,y x+y=-5,xy=4,求x-yx+y=9,xy=10,求x^2+y^2,x^3+y^3,x^4+y^4
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