[panpole]

ข้อ 1
ให้ m = 6-9/6-9/6-9/...
m = 6-9/m
m = 6m/m - 9/m
m^2 = 6m - 9
m^2 - 6m + 9 =0
(m-3)^2 = 0
m = 3

a = 8 - 36/m
a = 8 - 36/3
a = 8 - 12
a = -4

(a)^4 + 7(a)^3 + 12(a)^2 + 14(a) + 20
(-4)^4 + 7(-4)^3 + 12(-4)^2 + 14(-4) + 20 = -36