已知x+y=3,xy=-2,求x^3+y^3的值fast!

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已知x+y=3,xy=-2,求x^3+y^3的值fast!已知x+y=3,xy=-2,求x^3+y^3的值fast!已知x+y=3,xy=-2,求x^3+y^3的值fast!x^3+y^3=(x+y)

已知x+y=3,xy=-2,求x^3+y^3的值fast!
已知x+y=3,xy=-2,求x^3+y^3的值
fast!

已知x+y=3,xy=-2,求x^3+y^3的值fast!
x^3+y^3
=(x+y)(x²-xy+y²)
=(x+y)[(x+y)²-3xy]
=3×(3²+6)
=45

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