题目内容
(1)计算:(2
)
+(lg5)0+(
) -
;
(2)解方程:log3(6x-9)=3.
| 7 |
| 9 |
| 1 |
| 2 |
| 27 |
| 64 |
| 1 |
| 3 |
(2)解方程:log3(6x-9)=3.
(1)(2
)
+(lg5)0+(
)-
=(
)
+(lg5)0+[(
)3] -
=
+1+
=4.
(2)由方程log3(6x-9)=3得
6x-9=33=27,
∴6x=36=62,∴x=2.
经检验,x=2是原方程的解.
∴原方程的解为x=2.
| 7 |
| 9 |
| 1 |
| 2 |
| 27 |
| 64 |
| 1 |
| 3 |
=(
| 25 |
| 9 |
| 1 |
| 2 |
| 3 |
| 4 |
| 1 |
| 3 |
=
| 5 |
| 3 |
| 4 |
| 3 |
(2)由方程log3(6x-9)=3得
6x-9=33=27,
∴6x=36=62,∴x=2.
经检验,x=2是原方程的解.
∴原方程的解为x=2.
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