若(3x+4)²=9x²-kx+16,则k=?
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若(3x+4)²=9x²-kx+16,则k=?若(3x+4)²=9x²-kx+16,则k=?若(3x+4)²=9x²-kx+16,则k=?K
若(3x+4)²=9x²-kx+16,则k=?
若(3x+4)²=9x²-kx+16,则k=?
若(3x+4)²=9x²-kx+16,则k=?
K=-24 .
(3x+4)²=9x²+24x+16所以k=-24