当K=( )时,多项式x²-(1/3)kxy+3y²-3xy+8中不含xy项
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![当K=( )时,多项式x²-(1/3)kxy+3y²-3xy+8中不含xy项](/uploads/image/z/3732842-2-2.jpg?t=%E5%BD%93K%3D%28+%29%E6%97%B6%2C%E5%A4%9A%E9%A1%B9%E5%BC%8Fx%26%23178%3B-%EF%BC%881%2F3%EF%BC%89kxy%2B3y%26%23178%3B-3xy%2B8%E4%B8%AD%E4%B8%8D%E5%90%ABxy%E9%A1%B9)
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当K=( )时,多项式x²-(1/3)kxy+3y²-3xy+8中不含xy项
当K=( )时,多项式x²-(1/3)kxy+3y²-3xy+8中不含xy项
当K=( )时,多项式x²-(1/3)kxy+3y²-3xy+8中不含xy项
多项式x²-(1/3)kxy+3y²-3xy+8中不含xy项
则-1/3kxy-3xy=0
(-1/3k-3)xy=0
-1/3k-3=0
k=-9
当K=( -9 )时,多项式x²-(1/3)kxy+3y²-3xy+8中不含xy项
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不含xy项 -(1/3)kxy-3xy=0 -(1/3)k-3=0 k=-9