题目内容
计算:2log510+log50.25=
)-
+(
)
=
.
2
2
; (| 64 |
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| 8 |
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| 8 |
分析:利用对数的运算法则和运算性质,把2log510+log50.25等价转化为log5100+log50.25,由此能求出结果.
利用指数的运算法则和运算性质,把(
)-
+(
)
等价转化为[(
)2] -
+[(
)3]
,由此能求出结果.
利用指数的运算法则和运算性质,把(
| 64 |
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| 8 |
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解答:解:2log510+log50.25
=log5100+log50.25
=log525
=2.
(
)-
+(
)
=[(
)2] -
+[(
)3]
=(
)-1+(
)2
=
+
=
.
故答案为:2,
.
=log5100+log50.25
=log525
=2.
(
| 64 |
| 49 |
| 1 |
| 2 |
| 27 |
| 8 |
| 2 |
| 3 |
=[(
| 8 |
| 7 |
| 1 |
| 2 |
| 3 |
| 2 |
| 2 |
| 3 |
=(
| 8 |
| 7 |
| 3 |
| 2 |
=
| 7 |
| 8 |
| 9 |
| 4 |
=
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| 8 |
故答案为:2,
| 25 |
| 8 |
点评:本题考查对数和指数的运算法则和运算性质,是基础题.解题时要认真审题,仔细解答.
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