一元二次方程 9（2x+3）^2=4(2x-5)怎么解?
右边没有平方..
人气：288 ℃ 时间：2020-02-05 01:28:31
解答
9*(4x^2+12x+9)=8x-20
36x^2+100x+101=0
求根公式算
先求b^2-4ac
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