4.比較下列各數之大小:
Ə
O
9
(1) a= log2 0.2 b=logo30.2 c=log, 0.2 d = log, 0.2
(2) a = logo.2 2_, b= log2 c=log, 2 d = log, 2
(3) a= log₁.4 0.5
b= log₁.5 0.4 c=log,4,
d = log45
50.5
+
+
(1) b>a>c>d
(²) d>c>a>b
9
9
9
9
(3)
Ans: (1)b>a>d>c (2)c>d>a>b___ (3)b>d>c>a
