题目内容
计算
(1)(2
)0+2-2×(2
)
-4-0.5
(2)log2(47×22)-lg25-2lg2-log
.
(1)(2
| 3 |
| 5 |
| 1 |
| 4 |
| 1 |
| 2 |
(2)log2(47×22)-lg25-2lg2-log
| 3 |
| 1 |
| 27 |
分析:(1)由有理数指数幂的运算性质对(2
)0+2-2×(2
)
-4-0.5化简即可计算出答案;
(2)由对数的运算性质对log2(47×22)-lg25-2lg2-log
化简计算即可得出答案.
| 3 |
| 5 |
| 1 |
| 4 |
| 1 |
| 2 |
(2)由对数的运算性质对log2(47×22)-lg25-2lg2-log
| 3 |
| 1 |
| 27 |
解答:解:(1)(2
)0+2-2×(2
)
-4-0.5=1+
×(
)
-
=1-
×
-
=
(2)log2(47×22)-lg25-2lg2-log
=log2216-(lg25+lg4)-
log33-3=16-2+
=
.
| 3 |
| 5 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 22 |
| 9 |
| 4 |
| 1 |
| 2 |
| 1 |
| 40.5 |
| 1 |
| 4 |
| 3 |
| 2 |
| 1 |
| 2 |
| 1 |
| 8 |
(2)log2(47×22)-lg25-2lg2-log
| 3 |
| 1 |
| 27 |
| 1 |
| 2 |
| 3 |
| 2 |
| 31 |
| 2 |
点评:本题考查指数的运算性质与对数的运算性质,熟练掌握指数与对数的运算性质是解题的关键
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