问题
解答题
求值: (1)lg25+lg2lg50+23+
(2)
|
答案
(1)lg25+lg2lg50+23+
log251 2
=lg25+lg2(lg2+lg25)+23•2log25
=lg25+2lg2lg5+lg22+85
=(lg2+lg5)2+85
=1+8
;5
(2)
+3-2 2
+(3 (1-
)32
-1)0+(0.027)-2 1 3
=
+(
-1)22
+1+(0.33)-3 (1-
)32 1 3
=
-1+1-2
+1+2 10 3
=
.13 3