问题
解答题
计算下列各式: (1)(2
(2)log3
|
答案
(1)原式=(
)2-1-(9 4
)-27 8
+(2 3
)-23 2
=(
)2×3 2
-1-(1 2
)-3×3 2
+(2 3
)-23 2
=
-1-(3 2
)-2+(3 2
)-2=3 2 1 2
(2)原式=log3
+lg(25×4)+23 3 4 3
=log33-
+lg102+21 4
=-
+2+2=1 4 15 4