(1)计算:(27/9) 1/2+(lg5)0+(27/64) −1/3; (2)解方程:log3(6x-9)=3.

问题描述:

(1)计算:(2

7
9
 
1
2
+(lg5)0+(
27
64
 
1
3

(2)解方程:log3(6x-9)=3.

(1)(2

7
9
)
1
2
+(lg5)0+(
27
64
)
1
3

=(
25
9
 
1
2
+(lg5)0+[(
3
4
3] 
1
3

=
5
3
+1+
4
3
=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.