
解方程2x²-5x-8=0(用配方法)
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解答如下:
2x² - 5x - 8 = 0
x² - 5x/2 - 4 = 0
(x - 5/4)² = 4 + 25/16
x - 5/4 = ±√89/4
x = (5 ± √89)/4
2x² - 5x - 8 = 0
x² - 5x/2 - 4 = 0
(x - 5/4)² = 4 + 25/16
x - 5/4 = ±√89/4
x = (5 ± √89)/4
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