题目内容
(Ⅰ)求值:
-(
)-
+(
-
)0;
(Ⅱ)已知:2a=5b=10,求
+
的值.
|
| 27 |
| 8 |
| 2 |
| 3 |
| 3 |
| 2 |
(Ⅱ)已知:2a=5b=10,求
| 1 |
| a |
| 1 |
| b |
(Ⅰ)
-(
)-
+(
-
)0=
-(
)3×(-
)+1=
-(
)-2+1=
-
+1=1.
(Ⅱ)由2a=5b=10,得a=log210,b=log510,
所以
+
=
+
=lg2+lg5=lg10=1.
|
| 27 |
| 8 |
| 2 |
| 3 |
| 3 |
| 2 |
| 4 |
| 9 |
| 3 |
| 2 |
| 2 |
| 3 |
| 4 |
| 9 |
| 3 |
| 2 |
| 4 |
| 9 |
| 4 |
| 9 |
(Ⅱ)由2a=5b=10,得a=log210,b=log510,
所以
| 1 |
| a |
| 1 |
| b |
| 1 |
| log210 |
| 1 |
| log510 |
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