解方程2x²-3x-6=0
用配方法,过程详细
人气：279 ℃ 时间：2020-05-09 09:45:50
解答
2x²-3x-6=0
x² - 3/2 x - 3 =0
x² - 3/2 x + 9/16 = 3 + 9/16
(x -3/4)² = 57/16
x -3/4 = ±√57 /4
x = (3±√57) / 4
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