Question

一道应该算是很简单滴解方程= =

Answer 1

2X² + 5X - 3 = 0

2(X² + 2* 5/4 * X ) = 3

2 (X + 5/4)² = 3 + 2*(5/4)²

2 (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 = -3