当K=( )时,代数式X^2-3KXY-3Y^2-3/1XY-8中不含XY项
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当K=( )时,代数式X^2-3KXY-3Y^2-3/1XY-8中不含XY项
当K=( )时,代数式X^2-3KXY-3Y^2-3/1XY-8中不含XY项
当K=( )时,代数式X^2-3KXY-3Y^2-3/1XY-8中不含XY项
X^2-3KXY-3Y^2-3/1XY-8中不含XY项,
-3k-1/3=0
k=-1/9
X^2-3KXY-3Y^2-3/1XY-8
=X^2-(3K-3/1)XY-3Y^2-8
不含xy想3k-3/1=0
3k=3/1
k=9/1
当K=( 9/1)时,代数式X^2-3KXY-3Y^2-3/1XY-8中不含XY项