一道应该算是很简单滴解方程= =

问题描述:

一道应该算是很简单滴解方程= =
2x2+5x-3=0
用配方法,突然给忘了咋用了(T ^ T)

2X² + 5X - 3 = 02(X² + 2* 5/4 * X ) = 32 (X + 5/4)² = 3 + 2*(5/4)²2 (X + 5/4)² = 49/8 (X + 5/4)² = 49/16 = (7/4)²得到 X + 5/4 = ± 7/4解得X = 2/4 = 1/2或X= -12/4 = -...