Question

sunset.

求解和解析(⁠｡⁠ŏ⁠﹏⁠ŏ⁠)

* 36x²= ax (x-1) (x-2) + bx(x-1) + (x +d
試求ab.cd的值
本

Answer 1

lara

先展開，再看係數合

Ny-Ålesund

f(0) = d = 0

f(1) = c + d = 1 => c = 1

f(2) = 2b + 2c + d = 8

2b + 2 = 8 => b = 3

a：單看 x^3 係數 => a = 1

lara

喔，我不小心乘錯了
=aX3-3aX2+2aX+bX2-bX+cX+d
⇒ X：2a-b+c=0 ⇒c=1