已知x²-y²=-8,xy=-3,求5x²-3xy+4y²+11xy-7x²-2y²的值
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已知x²-y²=-8,xy=-3,求5x²-3xy+4y²+11xy-7x²-2y²的值
已知x²-y²=-8,xy=-3,求5x²-3xy+4y²+11xy-7x²-2y²的值
已知x²-y²=-8,xy=-3,求5x²-3xy+4y²+11xy-7x²-2y²的值
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