(3x 1)^2=6(3x 1) 3

问题描述:

(3x 1)^2=6(3x 1) 3
(3X+1)^2=6(3x+1)+3
不好意思没注意到少了加号

(3X+1)² = 6(3x+1)+39X² + 6X + 1 = 18X + 99X² - 12X - 8 = 0(9X² - 12X + 4) - 4 - 8 = 0(3X - 2)² = 123X - 2 = ± 2√33X = 2 ± 2√3X = (2 ± 2√3) / 3