(2x-1)² (2x-1)的四次方+(1-2x)的五次方
(2x - 1)² (2x-1)^4 + (1 - 2x)^5
= (2x - 1)² (2x-1)^4 - (2x - 1)^5 → 用到 (- x)^奇数次方 = - x^奇数次方
= (2x - 1)^5 * (2x - 1)^1 - (2x - 1)^5 → 用到 x^A *x^B = x^(A +B) → 表示次方
= (2x - 1)^5 *(2x - 1 - 1)
= (2x - 1)^5 *(2x - 2)
= 2(2x - 1)^5 *(x - 1)