已知2x²+xy=6,3y²+2xy=9,求4x²+8xy+9y²的值为
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![已知2x²+xy=6,3y²+2xy=9,求4x²+8xy+9y²的值为](/uploads/image/z/1333287-63-7.jpg?t=%E5%B7%B2%E7%9F%A52x%26%23178%3B%2Bxy%3D6%2C3y%26%23178%3B%2B2xy%3D9%2C%E6%B1%824x%26%23178%3B%2B8xy%2B9y%26%23178%3B%E7%9A%84%E5%80%BC%E4%B8%BA)
已知2x²+xy=6,3y²+2xy=9,求4x²+8xy+9y²的值为
已知2x²+xy=6,3y²+2xy=9,求4x²+8xy+9y²的值为
已知2x²+xy=6,3y²+2xy=9,求4x²+8xy+9y²的值为
2x²+xy=6两边同时乘以2的4x²+2xy=12
3y²+2xy=9两边同时乘以9y²+6xy=27
两个得到的等式相加得4x²+8xy+9y²=12+27=39