已知x+y=9 xy=10,求x²+y²,x³+y³,x^4+y^4,
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已知x+y=9 xy=10,求x²+y²,x³+y³,x^4+y^4,
已知x+y=9 xy=10,求x²+y²,x³+y³,x^4+y^4,
已知x+y=9 xy=10,求x²+y²,x³+y³,x^4+y^4,