✔ 最佳答案
6
Sol
(3+√3+√5)(3+√3-√5)
=(3+√3)^2-5
=12+6√3-5
=7+6√3
7
Sol
1 -9 10 -18 20 -72|
8 -8 16 -16 32|8
─────────────────────
1 -1 2 -2 4 |-40
餘式=-40
10
Sol
2x^3+7x^2+2x-3
=(2x^3+2x^2)+(5x^2+5x)+(-3x-3)
=2x^2(x+1)+5x(x+1)-3(x+1)
=(2x^2+5x--3)(x+1)
==(2x-1)(x+3)(x+1)