我女朋友刚刚跟我说这是一元三次方程式,但她懒得算=( 而你的题目刚好是复古题,所以我在网路上帮你找到答案了
2x³ - 3x² - 11x + 6 = 0
First find a root by inspection:
P(x) = 2x³ - 3x² - 11x + 6
P(-2) = -16 -12 + 22 + 6 = 0 so (x + 2) is a factor of P(x)
Then after doing synthetic division:
2x² - 7x + 3 is found as a quadratic factor of P(x)
Factoring the quadratic:
(2x - 1)(x - 3)
So (x + 2)(2x - 1)(x - 3) = 0
x + 2 = 0 or 2x - 1 = 0 or x - 3 = 0
x = -2 or x = 1/2 or x = 3