(x+1)(x-3)=2x+5解方程
人气:295 ℃ 时间:2020-03-27 00:53:38
解答
(x+1)(x-3)=2x+5
x²-2x-3=2x+5
x²-4x=8
x²-4x+4=8+4
(x-2)²=12
x-2=±2√3
x=2-2√3,x=2+2√3
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