1-( 1 12 + 1 15 )×2 = 6 7 - 6 7 ×( 2 3 + 1 9 ) = 15 16 ÷( 5
1个回答

(1)1-(

1

12 +

1

15 )×2,

=1-(

5

60 +

4

60 )×2,

=1-

9

60 ×2,

=1-

3

10 ,

=

7

10 ;

(2)

6

7 -

6

7 ×(

2

3 +

1

9 ),

=

6

7 -

6

7 ×(

6

9 +

1

9 ),

=

6

7 -

6

7 ×

7

9 ,

=

6

7 ×(1-

7

9 ),

=

6

7 ×

2

9 ,

=

4

21 ;

(3)

15

16 ÷(

5

12 ÷

5

8 +

3

8 ),

=

15

16 ÷(

5

12 ×

8

5 +

3

8 ),

=

15

16 ÷(

8

12 +

3

8 ),

=

15

16 ÷(

16

24 +

9

24 ),

=

15

16 ÷

25

24 ,

=

15

16 ×

24

25 ,

=

9

10 ;

(4)(

5

6 -

1

4 ×

2

3 )÷

1

6 ,

=(

5

6 -

1

6 )÷

1

6 ,

=

4

6 ×6,

=4;

(5)

4

9 ÷[(

2

3 -

2

9 )×

2

4 ],

=

4

9 ÷[(

6

9 -

2

9 )]×

1

2 ],

=

4

9 ÷[

4

9 ×

1

2 ],

=

4

9 ÷

2

9 ,

=

4

9 ×

9

2 ,

=2;

(6)(

3

8 -

1

4 )÷(

8

9 ×

3

4 ),

=(

3

8 -

2

8 )÷

2

3 ,

=

1

8 ×

3

2 ,

=

3

16 .