题目内容
(重点班做)计算下列各式的值:
(1)(0.0081)-
-[3×(
)0]-1×[81-0.25+(3
)-
]-
-10×0.027
;
(2)2(lg
)2+lg
•lg5+
.
(1)(0.0081)-
1 |
4 |
7 |
8 |
3 |
8 |
1 |
3 |
1 |
2 |
1 |
3 |
(2)2(lg
2 |
2 |
(lg
|
(1)原式=(
)-
-(3)-1×[(34)-
+(
)-
]-
-10×(
)
=
-
-3=0
(2)原式=2(
lg2)2+
lg2•lg5+
=
(lg2)2+
lg2•lg5+
=
(lg2)2+
lg2•lg5+1-
lg2
=
lg2(lg2+lg5)+1-
lg2
=1.
34 |
104 |
1 |
4 |
1 |
4 |
33 |
23 |
1 |
3 |
1 |
2 |
33 |
103 |
1 |
3 |
10 |
3 |
1 |
3 |
(2)原式=2(
1 |
2 |
1 |
2 |
(
|
=
1 |
2 |
1 |
2 |
(
|
=
1 |
2 |
1 |
2 |
1 |
2 |
=
1 |
2 |
1 |
2 |
=1.
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