若2y的平方+3y+7=8分之1,求4y的平方+6y-9的值
急.
人气：266 ℃ 时间：2019-10-19 15:34:33
解答
2y^2+3y+7=1/8
2y^2+3y=-55/8
4y^2+6y-9
=2(2y^2+3y)-9
=2*(-55/8)-9
=-55/4-9
=-91/4
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