计算.(能简算的要用简便方法计算.) 5 12 × 7 25 × 3 14 7 9 ÷ 1 2 ÷ 35 36 1 14
1个回答

(1)

5

12 ×

7

25 ×

3

14 ,

=

7

60 ×

3

14 ,

=

1

40 ;

(2)

7

9 ÷

1

2 ÷

35

36 ,

=

14

9 ×

36

35 ,

=

8

5 ;

(3)

1

14 ×(

7

8 +7),

=

1

14 ×

7

8 +7×

1

14 ,

=

1

16 +

1

2 ,

=

9

16 ;

(4)

3

5 ×

8

9 ÷

5

8 ,

=

8

15 ×

8

5 ,

=

64

75 ;

(5)

5

6 ×

1

4 +

5

6 ×

3

4 ,

=

5

6 ×(

1

4 +

3

4 ),

=

5

6 ×1,

=

5

6 ;

(6)96×

4

5 -36÷

5

4 +

4

5 ×40,

=96×

4

5 -36×

4

5 +

4

5 ×40,

=(96-36+40)×

4

5 ,

=100×

4

5 ,

=80;

(7)

4

9 ÷[(

1

3 -

1

9 )×2],

=

4

9 ÷[

2

9 ×2],

=

4

9 ÷

4

9 ,

=1;

(8)

3

4 +

7

9 +

1

4 -

4

9 ,

=(

3

4 +

1

4 )+(

7

9 -

4

9 ),

=1+

1

3 ,

=1

1

3 ;

(9)

2

7 ×

5

9 ÷

2

7 ×

5

9 ,

=

2

7 ×

5

9 ×

7

2 ×

5

9 ,

=(

2

7 ×

7

2 )×(

5

9 ×

5

9 ),

=1×

25

81 ,

=

25

81 ;

(10)(

11

12 -

3

7 )-(

4

7 -

7

12 ),

=

11

12 -

3

7 -

4

7 +

7

12 ,

=(

11

12 +

7

12 )-(

3

7 +

4

7 ),

=

3

2 -1,

=

1

2 ;

(11)

3

5 ×0.25+

3

5 ×

3

4 ,

=

3

5 ×(0.25+

3

4 ),

=

3

5 ×1,

=

3

5 .