知识大全 脱式计算(能简算要用简便方法计算).(1)56×( 3 7 - 3 8 ) (2)9.75-3.42

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脱式计算(能简算要用简便方法计算).(1)56×( 3 7 - 3 8 ) (2)9.75-3.42

(1)56×(
3
7
-
3
8

),
=56×

3
7

-56×

3
8


=24-21,
=3;

(2)9.75-3.42-5.58,
=9.75-(3.42+5.58),
=9.75-9,
=0.75;

(3)2.1×0.5÷4.2,
=2.1÷4.2×0.5,
=0.5×0.5,
=0.25;

(4)
3
8

×

6
7

+

6
7

÷8,
=(

3
8

+

1
8

)×

6
7


=

1
2

×

6
7


=

3
7

(5)(1-

8
15

×

1
2

)÷

4
5


=

11
15

×

5
4


=

11
12

(6)35÷[(

5
6

-

2
3

)×3],
=35÷[

1
6

×3],
=35×2,
=70.

计算(能简算的要用简便方法计算) 5 6 × 9 4 - 7 3 × 3 8

(1)
5
6
×
9
4

-

7
3

×

3
8

=

15
8

-

7
8


=1;

(2)8-3

1
7

-2

3
7


=8-(3

1
7

+2

3
7

),
=8-5

4
7


=2

3
7

(3)3.2×

3
8

÷1

2
5

=1.2×

5
7


=

6
7

(4)2.75-1

5
6

+3

1
4

-2

1
6


=(2.75+3.25)-(1

5
6

+2

1
6

),
=6-4,
=2.

脱式计算,能简算的要用简便方法计算. 17 20 × 5 7 + 2 7 × 17

(1)
17
20
×
5
7

+

2
7

×

17
20


=

17
20

×(

5
7

+

2
7

),
=

17
20

×1,
=

17
20

(2)

7
20

÷[

1
2

×(

2
3

+

4
5

)],
=

7
20

÷[

1
2

×

22
15

],
=

7
20

÷

11
15


=

7
20

×

15
11


=

21
44

(3)12×(

1
4

+

1
6

),
=12×

1
4

+12×

1
6


=3+2,
=5.

能简算的要用简便方法计算.2- 3 8 - 1 8 7 8 - 5 12 +

(1)2-
3
8
-
1
8


=2-(

3
8

+

1
8

),
=2-

1
2


= 1

1
2


(2)

7
8

-

5
12

+

1
6


=

7
8

-(

5
12

-

1
6

),
=

7
8

-

1
4


=

5
8


(3)

2
9

+

1
4

+

3
4

+

2
3


=(

2
9

+

2
3

)+(

1
4

+

3
4

),
=

8
9

+ 1,
= 1

8
9


(4)

5
8

-(

1
3

+

1
8

),
=

5
8

-

1
8

-

1
3


=

1
2

-

1
3


=

1
6

脱式计算.(能用简便方法计算的要用简便方法计算) (1)13.6×3-40.6÷2 (2)99×0.75+14×99 (3

(1)13.6×3-40.6÷2,
=40.8-20.3,
=20.5;

(2)99×0.75+

1
4

×99,
=99×(0.75+0.25),
=99×1,
=99;

(3)(

5
6

?

5
8

)×24,
=

5
6

×24-

5
8

×24,
=20-15,
=5;

(4)121×100

1
121


=121×(100+

1
121

),
=121×100+121×

1
121


=12100+1,
=12101;

(5)15÷3?7×(

1
7

+

1
21

),
=15÷3-7×

4
21


=5-1

1
3


=3

2
3

(6)24

6
23

÷6?

1
23


=4

1
23

-

1
23


=4.

脱式计算能简算的要用简便方法计算。1+2+4+8+16+32+64+128+256+512+102

2.5×0.32×125
=(2.5×0.4)×(0.8×125)
=1×100
=100

907×99+907
=907×(99+1)
=907×100
=90700

(1/3+1/4+1/5)×60
=(1/3)×60+(1/4)×60+(1/5)×60
=20+15+12
=47

[(1/7)-(1/9)]×63-(2/3)
=(1/7)×63-(1/9)×63-(2/3)
=9-7-(2/3)
=1又1/3

(3/5)×[(2/8)×2-(1/3)]
=(3/5)×[(1/2)-(1/3)]
=(3/5)×(1/6)
=1/10

(4/5)-[(1/5)+(1/3)]÷(4/5)
=(4/5)-(1/5)-(1/3)×(5/4)
=(4/15)×(5/4)
=1/3
12.5×4×0.25×8
=(12.5×8)×(4×0.25)
=100×1
=100

(6/7)×125×7×8
=[(6/7)×7]×(125×8)
=6×1000
=6000

24×[(5/8)+(5/6)]-35
= 24×(5/8)+24×(5/6)-35
=15+20-35
=35-35
=0

(分数我用括号括起来了,写的时候记得去掉,5/8读作八分之五,应该看得懂吧!)

有疑问,请追问

脱式计算(能简算的要用简便方法计算): ①80÷(1-84%) ②5-5× 2 5 +

①80÷(1-84%),
=80÷0.16,
=500;②5-5×
2
5

+

3
5


=5-2+

3
5


=3

3
5

③0.25×32×12.5%,
=0.25×4×8×0.125,
=(0.25×4)×(8×0.125),
=1×1,
=1;

7
9

÷

11
5

+

2
9

×

5
11


=

7
9

×

5
11

+

2
9

×

5
11


=(

7
9

+

2
9

)×

5
11


=1×

5
11


=

5
11

脱式计算,能简便的要用简便方法计算(1)5120÷32+140(2)( 1 3 - 1 6 + 4

(1)5120÷32+140,
=160+140,
=300;(2)(
1
3

-

1
6

+

4
5

)×30,
=

1
3

×30-

1
6

×30+

4
5

×30,
=10-5+24,
=5+24,
=29;

(3)[1-(

1
2

-

1
4

)]×

2
3


=[1-

1
4

2
3


=

3
4

×

2
3


=

1
2

(4)168.1÷(4.3×2-0.4),
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5.

脱式计算能简算的要用简便方法计算。 7分之2乘1.6除(10-8分之7除16分之3)

2/7x1.6÷(10-7/8÷3/16)
=2/7x1.6÷(10-14/3)
=2/7x1.6÷16/3
=2/7x3/10
=3/35

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