问题
解答题
计算: (1)(2
(2)lg25+lg2lg50+21+
|
答案
(1)原式=(
)9 4
-1-(1 2
)-27 8
+(2 3
)-23 2
=
-1-(3 2
)-2+(3 2
)-23 2
=
.1 2
(2)原式=lg25+2lg2lg5+lg22+21•2
log251 2
=1+2
.5
计算: (1)(2
(2)lg25+lg2lg50+21+
|
(1)原式=(
)9 4
-1-(1 2
)-27 8
+(2 3
)-23 2
=
-1-(3 2
)-2+(3 2
)-23 2
=
.1 2
(2)原式=lg25+2lg2lg5+lg22+21•2
log251 2
=1+2
.5