问题
解答题
计算: (1)2 -
(2)log49-log212+10 -lg
|
答案
(1)2 -
+1 2
+(-4)0 2
-1
-12
=(1-
)05
+2 2
+2 2
=22
;2
(2)log49-log212+10 -lg
=log23-log23-log24+5 2
=-2+2 5
=-2 5
.8 5
计算: (1)2 -
(2)log49-log212+10 -lg
|
(1)2 -
+1 2
+(-4)0 2
-1
-12
=(1-
)05
+2 2
+2 2
=22
;2
(2)log49-log212+10 -lg
=log23-log23-log24+5 2
=-2+2 5
=-2 5
.8 5