问题
解答题
计算: (1)2-
(2)log225•log3
|
答案
(1)=2-
+1 2
+1 2
-1
-12 1
=2-
+2-1 2
+1 2
+1-12
=2•2-
+1 2 2
=
+2
=22
(6分)2
(2)=log252•log32-4•log53-2
=
•2lg5 lg2
•(-4)lg2 lg3
=16(6分)(-2)lg3 lg5
计算: (1)2-
(2)log225•log3
|
(1)=2-
+1 2
+1 2
-1
-12 1
=2-
+2-1 2
+1 2
+1-12
=2•2-
+1 2 2
=
+2
=22
(6分)2
(2)=log252•log32-4•log53-2
=
•2lg5 lg2
•(-4)lg2 lg3
=16(6分)(-2)lg3 lg5