题目内容
计算下列各题
(1)计算(3
)-
-(
-1)0+
-(2
)
(2)计算
.
(1)计算(3
3 |
8 |
2 |
3 |
2 |
23-6
|
2 |
1 |
3 |
(2)计算
lg5•lg8000+(lg2
| |||
(log23+log49+log827+…+log2n3n)×log9
|
分析:(1)利用指数幂的运算性质即可求出;
(2)利用对数的运算性质即可求出.
(2)利用对数的运算性质即可求出.
解答:解:(1)原式=[(
)-3]-
-1+
-(2
)
=
-1+
-
=
-1+
+
-
=
;
(2)原式=
=
=
=
2 |
3 |
2 |
3 |
23-6(2-
|
3 |
2 |
1 |
3 |
4 |
9 |
11+2
|
2 |
4 |
9 |
9 |
2 |
2 |
22 |
9 |
(2)原式=
lg5(3+3lg2)+3(lg2)2 | ||||
(log23+log23+…+log23)×
|
3lg5+3lg2(lg5+lg2) | ||
nlog23×
|
3 | ||
|
n2 |
36 |
点评:本题主要考查有理指数幂的运算法则和对数的运算法则,学习中应当做到非常熟练.
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