题目内容
计算
(1)
-
+(2
)-0.5-
π0
(2)log318-log32-log29•log34+2log23.
(1)
(2-e)2 |
3 | e
| ||||
7 |
9 |
3 |
5 |
(2)log318-log32-log29•log34+2log23.
分析:(1)利用指数幂的运算性质即可得出;
(2)利用对数函数的运算性质即可得出.
(2)利用对数函数的运算性质即可得出.
解答:解:(1)原式=|2-e|-
+[(
)2]-
-
=e-2-
+(
)-1-
=e-2-e+
-
=-2.
(2)原式=log3
-
×
+3
=log332-4+3
=2-4+3
=1.
3 | e
| ||||
5 |
3 |
1 |
2 |
3 |
5 |
=e-2-
3 | e3 |
5 |
3 |
3 |
5 |
=e-2-e+
3 |
5 |
3 |
5 |
=-2.
(2)原式=log3
18 |
2 |
2lg3 |
lg2 |
2lg2 |
lg3 |
=log332-4+3
=2-4+3
=1.
点评:熟练掌握指数幂的运算性质、对数函数的运算性质是解题的关键.
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