已知2x²+xy=M,3y²+2xy=N,求4x²+8xy+9y²
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![已知2x²+xy=M,3y²+2xy=N,求4x²+8xy+9y²](/uploads/image/z/1670014-46-4.jpg?t=%E5%B7%B2%E7%9F%A52x%26%23178%3B%2Bxy%3DM%2C3y%26%23178%3B%2B2xy%3DN%2C%E6%B1%824x%26%23178%3B%2B8xy%2B9y%26%23178%3B)
已知2x²+xy=M,3y²+2xy=N,求4x²+8xy+9y²
已知2x²+xy=M,3y²+2xy=N,求4x²+8xy+9y²
已知2x²+xy=M,3y²+2xy=N,求4x²+8xy+9y²
4x²+8xy+9y²
=2(2x²+xy)+3(3y²+2xy)
=2M+3N
慢慢接
4x²+8xy+9y²
=4x²+2xy+6xy+9y²
=2(2x²+xy)+3(3y²+2xy)
=2M+3N