问题
解答题
(1)(2
(2) 计算:lg25+
|
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=2lg5+2lg2+lg5•(1+lg2)+lg22
=2(lg5+lg2)+lg5+lg2(lg5+lg2)
=2+lg5+lg2
=3
(1)(2
(2) 计算:lg25+
|
(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=2lg5+2lg2+lg5•(1+lg2)+lg22
=2(lg5+lg2)+lg5+lg2(lg5+lg2)
=2+lg5+lg2
=3