问题
解答题
求值: (1)lg500+lg
(2)(2
|
答案
(1)lg500+lg
-8 5
lg64+50(lg2+lg5)21 2
=(lg100+lg5)+(lg8-lg5)-
lg26+501 2
=(2+lg5)+(3lg2-lg5)-3lg2+50=52;
(2)(2
) 1 4
-(-2008)0-(31 2
) -3 8
+(2 3
)-23 2
=(
)9 4
-1-(1 2
)-27 8
+2 3 4 9
=
-1-3 2
+4 9 4 9
=
.1 2