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How to do the 46 questions of the seventh grade mathematics new observation 17? When the quadratic polynomial x +3KXY-2Y quadratic polynomial +6XY- 1 does not contain XY term, find the value of k.
x？ +3kxy-2y？ +6xy- 1 does not contain xy term, that is to say, the coefficient of xy term is 0, that is, 3k+6=0, then k=-2.
In simple words, it feels like this. .
I don't know if the questioner wants to discuss in categories, that is, when x=y and x ≠ y.
But seventh grade mathematics should be a first-line solution.