若多项式3x的平方-2xy+y的平方+kxy+x+1不含xy项,则k=
人气:383 ℃ 时间:2019-08-24 05:42:43
解答
3x² - 2xy + y² + kxy + x + 1
= 3x² + (k - 2)xy + y² + x + 1
因为不含 xy 项
所以k -2 = 0
k = 2
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