解方程x(3x-4)-7=2(x^2-2)+2x
人气:341 ℃ 时间:2020-03-20 02:32:59
解答
x(3x-4)-7=2(x^2-2)+2x
去括号得3x^2-4x-7=2x^2-4+2x
移项合并同类项得x^2-6x-3=0
配方得:(x-3)^2=12
两边同时开方得:x-3=±√12
x=3+2√3 或 x=3-2√3
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