问题
解答题
计算下列各题: (1)0.0081
(2)lg25+lg2lg50. |
答案
(1)原式0.0081
+(4-1 4
)2+(8)-3 4
-16-0.754 3
=(0.3)4×
+(2-1 4
)2+(23)-3 2
-2-4×0.754 3
=
+3 10
+1 8
-1 16 1 8
=
.(5分)29 80
(2)原式lg25+lg2lg50
=lg25+2lg2lg5+lg25
=(lg2+lg5)2
=1 (5分)