问题
解答题
求值: (1)(lg5)2+lg2•lg50; (2)(2
|
答案
(1)(lg5)2+lg2•lg50
=(lg5)2+lg2•(lg5+1)
=(lg5)2+lg2•lg5+lg2
=lg5(lg5+lg2)+lg2
=lg5+lg2
=1.
(2)(2
)1 4
-(-9.6)0-(31 2
)-3 8
+(1.5)-22 3
=(
)9 4
-1-(1 2
)-27 8
+(2 3
)22 3
=
-1-(3 2
)2+(2 3
)22 3
=
.1 2