已知2x-3y=-4,求4x²+8x+12y-9y²的值
人气：450 ℃ 时间：2020-03-25 12:01:33
解答
4x²+8x+12y-9y²
=(2x+3y)(2x-3y)+4(2x+3y)
=-4(2x+3y)+4(2x+3y)
=0
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