试题:
计算:
(1)2 -
1
2
+
(-4)0
2
+
1
2
-1
-
(1-
5
)0

(2)log49-log212+10 -lg
5
2

答案:

我来补答
(1)2 -
1
2
+
(-4)0
2
+
1
2
-1
-
(1-
5
)0
=
2
2
+
2
2
+
2
=2
2

(2)log49-log212+10 -lg
5
2
=log23-log23-log24+
2
5
=-2+
2
5
=-
8
5
 
 
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