（1）2-

1

2

+

(-4)0

2

+

1

2 -1

-

(1- 5 )0

=

2

2

+

2

2

+

2 +1

( 2 -1)( 2 +1)

-1

=

2

+

2

+1-1

=2

2

．

（2）

2

•4

1

2

•

3	82

•0.25

1

3

(3

1

3

•9

1

3

)2

=2

1

2

×(22)

1

2

×22×(

1

4

)

1

3

×32

=2

1

2

×2×22×2-6

=2

1

2

+1+2-6

=2-

5

2

=

2

8

．