知识大全 脱式计算下面各题,能简算的要简算.①8250÷25-33②6.35×29+7.1×63.5③( 45-23)÷( 2

Posted 等式

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脱式计算下面各题,能简算的要简算.①8250÷25-33②6.35×29+7.1×63.5③( 45-23)÷( 2

①8250÷25-33
=330-33,
=297;

②6.35×29+7.1×63.5
=6.35×29+71×.35,
=6.35×(29+71),
=6.35×100,
=635;

③(

4
5

-

2
3

)÷(

2
3

+

1
4


=

2
15

÷

11
12


=

8
55

④(

3
4

+

7
8

÷

14
15

)×

8
9

=(

3
4

+

15
16

)×

8
9


=

27
16

×

8
9


=

3
2

计算下列各题,能简算的要简算:(1)(4800÷75+36)×12 (2)29÷[56×(45-23)] (3)3.8×99+3.8

(1)(4800÷75+36)×12,
=(64+36)×12
=100×12,
=1200;

(2)

2
9

÷[

5
6

×(

4
5

?

2
3

)],
=

2
9

÷[

5
6

×(

12
15

?

10
15

)],
=

2
9

÷[

5
6

×

2
15

],
=

2
9

÷

1
9


=

2
9

×9,
=2;

(3)3.8×99+3.8,
=3.8×(99+1)
=3.8×100,
=380;

(4)42×

40
41


=(41+1)×

40
41


=41×

40
41

+

40
41


=40

40
41

(5)(

1
2

+

2
3

-

1
4

)÷

1
24


=

1
2

×24+

2
3

×24-

1
4

×24,
=12+16-6,
=22;

(6)7.8-3.6+2.2-6.4,
=7.8+2.2-(3.6+6.4),
=10-10,
=0.

用递等式计算下面各题,能简算的要简算

7.8×5.6+2.3×4.4
=(2.3+5.5)×5.6+2.3×4.4
=2.3×5.6+5.5×5.6+2.3×
4.4
=2.3×(5.6+4.4)+5.5×5.6
=23+5.5×(4+1.6)
=23+5.5×4+5.5×1.6
=23+22+5.5×1+5.5×0.6
=55+5.5+3.3
=63.8

计算下面各题,能简算的要简算. 0.89×100.1 146.5-(23+46.5) 5

(1)0.89×100.1,
=0.89×(100+0.1),
=89+0.089,
=89.089;(2)146.5-(23+46.5),
=146.5-23-46.5,
=146.5-46.5-23,
=100-23,
=77;

(3)5.83×2+5.83×8,
=5.83×(2+8),
=5.83×10,
=58.3;

(4)45.9÷8÷0.125,
=45.9÷(8×0.125),
=45.9÷1,
=45.9.

计算下面各题,能简算的要简算①31.9×18-8×31.9②21÷(13+25)÷911③(23+215)×45④(1-1100×70)

①31.9×18-8×31.9,
=31.9×(18-8),
=31.9×10,
=319;

②21÷(

1
3

+

2
5

)÷

9
11


=21÷

11
15

÷

9
11


=21×

15
11

×

11
9


=35;

③(

2
3

+

2
15

)×45,
=

2
3

×45+

2
15

×45,
=30+6,
=36;

④(1-

1
100

×70)÷

2
7


=(1-

7
10

)÷

2
7


=

3
10

×

7
2


=

21
20

⑤12×(

1
4

+

1
6

-

1
3

),
=12×

1
4

+12×

1
6

-12×

1
3


=3+2-4,
=1;

⑥(

3
8

-0.125)÷0.5,
=(0.375-0.125)÷0.5,
=0.25÷0.5,
=0.5.

计算下面各题,能简算的要简算. (45+14)÷73+71079×(23-27) 415×613+613÷1511

(1)(

4
5

+

1
4

)÷

7
3

+

7
10

=

21
20

÷

7
3

+

7
10

=

9
20

+

7
10

=

23
20

(2)

7
9

×(

2
3

-

2
7


=

7
9

×

2
3

-

7
9

×

2
7

=

14
27

-

2
9

=

8
27

(3)

4
15

×

6
13

+

6
13

÷

15
11

=

4
15

×

6
13

+

6
13

×

11
15

=(

4
15

+

11
15

)×

6
13

=1×

6
13

=

6
13

计算下面各题,能简算的要简算.0.89×100.1146.5-(23+46.5)10÷0.

(1)0.89×100.1
=0.89×(100+0.1)
=0.89×100+0.89×0.1
=89+0.089
=89.089

(2)146.5-(23+46.5)
=146.5-46.5=23
=100-23
=77

(3)10÷0.2÷2.5
=10÷(0.2×2.5)
=100÷0.5
=200

(4)64×4.5+36×4.5
=(64+36)×4.5
=100×4.5
=450

(5)0.125×32×2.5
=(0.125×8)×(4×2.5)
=1×10
=10

(6)1.25×3.2×0.8
=(1.25×0.8)×3.2
=1×3.2
=3.2

计算下面各题,能简算的要简算:7.54+127+2.46+1670.4÷154+25×41

7.54+

12
7

+2.46+

16
7


=(7.54+2.46)+(

12
7

+

16
7

),
=10+4,
=14;

0.4÷

15
4

+

2
5

×

4
15


=

2
5

×

4
15

+

2
5

×

4
15


=

2
5

×(

4
15

+

4
15

),
=

2
5

×

8
15


=

16
75

3
23

÷(

6
7

?

5
6

×

3
10

),
=

3
23

÷(

6
7

-

1
4

),
=

3
23

÷

17
28


=

84
391

99×

23
25

+

23
25


=(99+1)×

23
25


=100×

23
25


=92.

计算下面各题,能简算的要简算. 3.2×5-12 146.5-(23+46.5) 5.83×

(1)3.2×5-12,
=16-12,
=4;(2)146.5-(23+46.5),
=146.5-23-46.5,
=146.5-46.5-23,
=100-23,
=77;

(3)5.83×2+4.27,
=11.66+4.27,
=15.93;

(4)0.5×4×2.33,
=2×2.33,
=4.66.

计算下面各题,能简算的要简算.35+71+29+65 125×5×8×2 43×23+57×23 [250-(43+132)]×18 90

(1)35+71+29+65,
=(35+65)+(71+29),
=100+100,
=200;

(2)125×5×8×2,
=(125×8)×(5×2),
=1000×10,
=10000;

(3)43×23+57×23,
=(43+57)×23,
=100×23,
=2300;

(4)[250-(43+132)]×18,
=[250-175]×18,
=75×18,
=1350;

(5)900÷[3×(48-23)],
=900÷(3×25),
=900÷75,
=12;

(6)99×76,
=(100-1)×76,
=100×76-1×76,
=7600-76,
=7524.

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