已知3x的平方-4x+1=2x的平方+5x+7,求5x的平方-45x-30
人气：342 ℃ 时间：2020-01-27 03:49:36
解答
∵3x²-4x+1=2x²+5x+7
∴x²-9x=6
∴5x²-45x=30
∴5x²-45x-30=0
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