（Ⅰ）lg24-（lg3+lg4）+lg5

=lg24-lg12+lg5

=lg

24×5

12

=lg10

=1；

（Ⅱ） (

3	3

×

2

)6+(

3 3

)

4

3

-

4	2

×80.25-(-2005)0

=3

1

3

×6×2

1

2

×6+3

3

4

×

4

3

-2

1

4

×2

3

4

-1

=3²×2³+3-2-1

=72．