问题
解答题
不用计算器求下列各式的值: (1)(
(2)log3
|
答案
(1)原式=(
)2×3 2
-1-(1 2
)-3×3 2
+(2 3
)-2+|π-4|3 2
=
-1-(3 2
)-2+(3 2
)-2+4-π3 2
=
-π.9 2
(2)原式=log3
+log5(100×0.25)+71÷7log723 3 4 3
=log33-
+log552+1 4 7 2
=-
+2+1 4 7 2
=
.21 4