19/08/29 05:47:57.30 0b3ON6VH0.net
1.
b=3a-1 (1/3≦a<1,1<a)
b=-a^3+3a^2 (0<a<1,1<a≦3)
3a-1<b<0 (0<a<1/3)
-a^3+3a^2<b<0 (3<a)
2.
(1) P(sin(θ-π/4),sin(θ+π/4),0)
Q(ηsin(θ-2π/3),ηsin(θ+2π/3),ηsinθ) (η=2/√6)
M:(1+tanθ)x+(1-tanθ)y+(1+√3)z=0
(2) (1,1,1-√3)
3.
(1) 1-(1/7)^n
(2) (6^n-1)/(5×6^n)
(3) 15(2^n-2)/(6^n-1)
4.
(1) αβ
(2)(ⅰ) α-β=1
(ⅱ) α=1+1/√3, β=1/√3
5.
n=1,2のとき、m=2,3,4,...
n≧3のとき、mは存在しない
6.
2π
宿題
ただ解くだけなので略