知识大全 计算下面各题,能简算的要用简便方法计算. 40.2-4÷80×2.4 34×(117+113)×13 3.9-5.7+7

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计算下面各题,能简算的要用简便方法计算. 40.2-4÷80×2.4 34×(117+113)×13 3.9-5.7+7

(1)40.2-4÷80×2.4,
=40.2-0.05×2.4,
=40.2-0.12,
=40.08;

(2)34×(

1
17

+

1
13

)×13,
=(34×13)×(

1
17

+

1
13

),
=34×

1
17

×13+13×

1
13

×34,
=2×13+1×34,
=26+34,
=60;

(3)3.9-5.7+7.1-2.3,
=(3.9+7.1)-(5.7+2.3),
=11-8,
=3;

(4)

9
20

÷[

2
3

×(

4
5

-

1
2

)],
=

9
20

÷[

2
3

×

3
10

],
=

9
20

÷

1
5


=

9
4

计算下列各题.能简算的要用简便方法计算.(34-316)×(29+13)  ...

(1)(

3
4

-

3
16

)×(

2
9

+

1
3

),
=

9
16

×

5
9


=

5
16


(2)125×0.25×3.2
=125×0.25×4×0.8,
=(125×0.8)×(0.25×4),
=100×1,
=100;
(3)

2
3

+(

3
5

?

1
4

)×

4
7


=

2
3

+

7
20

×

4
7


=

2
3

+

1
5


=

13
15


(4)

3
8

×

6
7

+

6
7

÷8,
=

3
8

×

6
7

+

6
7

×

1
8


=(

3
8

+

1
8

)×

6
7


=

1
2

×

6
7


=

3
7


(5)5025-2940÷28×37,
=5025-105×37,
=5025-3885,
=1140;
(6)(25+25+25)×

1
3

=25×3×

1
3


=25.

计算下面各题,能简算的要用简便方法计算. 23.4-5.7-4.3 (467+36×3)÷23 25×50×4×6 46×16+1

(1)23.4-5.7-4.3,
=23.4-(5.7+4.3),
=23.4-10,
=13.4;

(2)(467+36×3)÷23,
=(467+108)÷23,
=575÷23,
=25;

(3)25×50×4×6,
=(25×4)×(50×6),
=100×300,
=30000;

(4)46×16+16×54,
=(46+54)×16,
=100×16,
=1600;

(5)14.9+3.7+5.1+6.3,
=(14.9+5.1)+(3.7+6.3),
=20+10,
=30;

(6)3800÷(1280-72×15),
=3800÷(1280-1080),
=3800÷200,
=19;

(7)1800-800÷25×16,
=1800-32×16,
=1800-512,
=1288;

(8)65×102,
=65×(100+2),
=6500+130,
=6630;

(9)99×48+48,
=(99+1)×48,
=100×48,
=4800.

计算下面各题,能简算的要用简便方法计算.①250×8-245②10.15-6.25-3.75+7.85③ 7 8 ×

①250×8-245,
=2000-245,
=1755;②10.15-6.25-3.75+7.85,
=10.15+7.85-(6.25+3.75),
=18-10,
=8;

7
8

×

5
9

+

5
9

÷8,
=

7
8

×

5
9

+

5
9

×

1
8


=(

1
8

+

7
8

)×

5
9


=1×

5
9


=

5
9

④24+5÷(3-2.5),
=24+5÷0.5,
=24+10,
=34;

10
13

×(

3
4

+1÷

5
6

),
=

10
13

×(

3
4

+

6
5

),
=

10
13

×(

15
20

+

24
20

),
=

10
13

×

39
20


=

3
2

⑥2÷[4×(

1
2

-

1
3

)]
=2÷[4×(

3
6

-

2
6

)],
=2÷[4×

1
6

],
=2÷

2
3


=3.

计算下面各题,能简算的要用简便方法算.0.75+1.25×2.4 5.67×0.21-0.62 3...

(1)0.75+1.25×2.4
=0.75+(1.25×8)×0.3
=0.75+10×0.3
=0.75+3
=3.75;

(2)5.67×0.21-0.62
=1.1907-0.62
=0.5707;

(3)3.8×6.7+3.3×3.8
=3.8×(6.7+3.3)
=3.8×10
=38;

(4)1.28×0.29-0.29×0.28
=0.29×(1.28-0.28)
=0.29×1
=0.29;

(5)101×4.8
=(100+1)×4.8
=100×4.8+4.8
=480+4.8
=484.8;
    
(6)4.89×99+4.89
=4.89×(99+1)
=4.89×100
=489.

计算下面各题,能用简便方法计算的,要用简便方法计算.2.5×80×12.5×4648÷[35×(35-37)]521÷[(37

(1)2.5×80×12.5×4
=(2.5×4)×(12.5×80)
=10×1000
=10000;

(2)648÷[35×(

3
5

-

3
7

)]
=648÷[35×

3
5

-35×

3
7

]
=648÷(21-15)
=648÷6
=108;

(3)

5
21

÷[(

3
7

-

1
14

)×

5
6

]
=

5
21

÷[

5
14

×

5
6

]
=

5
21

÷

25
84

=

4
5

计算下面各题.(能简算的要用简便演算法)45.4×10.1 &...

(1)45.4×10.1
=45.4×(10+0.1)
=45.4×10+45.4×0.1
=454+4.54
=458.54;

(2)840÷0.5÷8
=840÷(0.5×8)
=840÷4
=210;

(3)6.24-0.24×18      
=6.24-4.32
=1.92;

(4)0.125×3.2×25
=0.125×(8×0.4)×25
=(0.125×8)×(0.4×25)
=1×10
=10.

计算下面各题(能简便计算的要用简便方法计算) 456-199 0.25×5.7×4 252÷24-0.4×6 (3.8-1.8÷2

(1)456-199,
=456-200+1,
=256+1,
=257;

(2)0.25×5.7×4,
=0.25×4×5.7,
=1×5.7,
=5.7;

(3)252÷24-0.4×6,
=10.5-2.4,
=8.1;

(4)(3.8-1.8÷2)×

1
2


=(3.8-0.9)×

1
2


=2.9×

1
2


=1.45;

(5)(8+

4
9

)÷4,
=(8+

4
9

)×

1
4


=8×

1
4

+

4
9

×

1
4


=2+

1
9


=2

1
9

(6)4.4-

1
5

+1.6-

4
5


=(4.4+1.6)-(

1
5

+

4
5

),
=6-1,
=5.

下面各题,能简算的要用简便方法计算.3.9+0.56+6.1+0.4450÷2.5+1.8×4.56.87×

(1)3.9+0.56+6.1+0.44,
=(3.9+6.1)+(0.56+0.44),
=10+1,
=11;(2)50÷2.5+1.8×4.5,
=20+8.1,
=28.1;

(3)6.87×[40÷(3.49-3.09)],
=6.87×[40÷0.4],
=6.87×100,
=687;

(4)0.8×(12.5+0.125),
=0.8×12.5+0.8×0.125,
=10+0.1,
=10.1.

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