Question

脱式计算，能简算的要简算．

475+660÷33×25	400-14 13 27 -85 14 27
( 5 9 + 7 8 - 11 12 )×36	5.84×1.36+1.36×3.16+1.36
[1.9-6÷（2.4×5）]÷（14×0.2）	[( 8 9 + 4 3 )× 3 4 - 1 4 ]÷ 1 12 ．

Answer 1

分析：按四则运算顺序解答

解答：解：475+660÷33×25
=475+20×25
=475+500
=975；
 （

5

9

+

7

8

-

11

12

）×36
=

5

9

×36+

7

8

×36-

11

12

×36
=20+

63

2

-33
=18.5
[1.9-6÷（2.4×5）]÷（14×0.2）
=[1.9-6÷12]÷2.8
=[1.9-0.5]÷2.8
=1.4÷2.8
=0.5
400-14

13

27

-85

14

27

=400-（14

13

27

+85

14

27

）
=400-100
=300；
5.84×1.36+1.36×3.16+1.36
=1.36×（5.84+3.16+1）
=1.36×10
=13.6；
[(

8

9

+

4

3

)×

3

4

-

1

4

]÷

1

12

=[(

8

9

+

4

3

)×

3

4

-

1

4

]×12
=[

8

9

×

3

4

+

4

3

×

3

4

-

1

4

]×12
=[

2

3

+1-

1

4

]×12
=

2

3

×12+1×12-

1

4

×12
=8+12-3
=17．

点评：按四则运算法则解题，能用规律简算的可以简算．