直接写计算结果 12.5× 1 7 ×0.56 = 9 5 7 -3 4 9 +2 4 9 -8 3 7 = 2 5 7
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(1) 12.5×

1

7 ×0.56 =1;

(2) 9

5

7 -3

4

9 +2

4

9 -8

3

7 ,

=(9

5

7 -8

3

7 )-(3

4

9 -2

4

9 ),

=1

2

7 -1,

=

2

7 ;

(3) 2

5

7 -(

3

5 -

2

7 ) ,

=2

5

7 -

3

5 +

2

7 ,

=27+

2

7 -

3

5 ,

=3 -

3

5 ,

=2

2

5 ;

(4)7800×8÷36×108÷26,

=7800×8×

1

36 ×108×

1

26 ,

=7200;

(5)

1

6 +

1

12 +

1

20 +

1

30 ,

=

1

2 -

1

3 +

1

3 -

1

4 +

1

4 -

1

5 +

1

5 -

1

6 ,

=

1

2 -

1

6 ,

=

1

3 ;

(6) 1

1

9 +2

1

90 +3

1

900 ,

=(1+2+3)+(

1

9 +

1

90 +

1

900 ),

=6+

37

300 ,

=6

37

300 .

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