判斷不同對數函數
\圖形底數的大小

y=log_ax

y=log_bx

y=log_cx

y=log_dx

請比較\;a,b,c,d\;與1的大小

考慮作直線\;L:y=1

L:y=1

考慮L與\;4\;個函數的交點
\y\;坐標都是\;1

a

b

d

c

觀察交點的\;x\;坐標

又對數函數必通過(1,0)

故a>b>1>d>c

s = 0 (slider from 0 to 11, step 1)
f_4(x) = log(0.7, x - 0.0073637313068057875)
f_3(x) = log(0.3, x)
f_1(x) = log(2, x)
f_2(x) = log(4, x)
B: (x(Corner[2]), 1)
A: (x(Corner[1]), 1)
t6 = 0 (slider from 0 to 1, step 0.01)
C: A + (t6 * Vector[A, B])
a_6 = Segment(A, C)
D = Corner(4)
E = Intersect(f_2, a_6, (4, 1))
F = Intersect(f_1, a_6, (2, 1))
G = Intersect(f_4, a_6, (0.7073637312327938, 1.000000000296436))
t8 = 0 (slider from 0 to 1, step 0.01)
E_1: (x(E), 0)
F_1: (x(F), 0)
G_1: (x(G), 0)
H = (0.3, 1)
H_1: (x(H), 0)
E_3: E + (t8 * Vector[E, E_1])
F_3: F + (t8 * Vector[F, F_1])
G_3: G + (t8 * Vector[G, G_1])
H_3: H + (t8 * Vector[H, H_1])
b_1 = Vector(E, E_3)
b_2 = Vector(F, F_3)
b_3 = Vector(G, G_3)
b_4 = Vector(H, H_3)
P = Corner(4)