知识大全 计算,能简算的用简便方法计算.375+450÷18×20 &.

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计算,能简算的用简便方法计算.375+450÷18×20 &..., 计算,能简算的用简便方法计算.375+450÷18×20 9.47+0.58-2.47 7 10 ×8.4+1.6×0.7

(1)375+450÷18×20,
=375+25×20,
=375+500,
=875;

(2)9.47+0.58-2.47,
=9.47-2.47+0.58,
=7+0.58,
=7.58;

(3)

7
10

×8.4+1.6×0.7,
=0.7×(8.4+1.6),
=0.7×10,
=7;

(4)

2
9

÷[

8
21

×(

1
3

+

5
12

)],
=

2
9

÷[

8
21

×

3
4

],
=

2
9

÷

2
7


=

7
9

计算下面各题,能简便计算的用简便方法计算.375+450÷18×25 &...

(1)375+450÷18×25,
=375+25×25,
=375+625,
=1000;

(2)

19
5

×

1
9

+

1
5

÷9,
=

19
5

×

1
9

+

1
5

×

1
9


=(

19
5

+

1
5

)×

1
9


=4×

1
9


=

4
9

(3)

3
10

÷(

5
2

-

5
3

)×

5
6


=

3
10

÷

5
6

×

5
6


=

3
10

×(

6
5

×

5
6

),
=

3
10

×1,
=

3
10

(4)13×(

1
26

+

2
11

)×22,
=(13×22)×(

1
26

+

2
11

),
=(13×22)×

1
26

+(13×22)×

2
11

计算,能简算的要简算(1)375+450÷18×25 &nb...

(1)375+450÷18×25,
=375+25×25,
=375+625,
=1000.

(2)4.38×5.6+56.2×0.56,
=4.38×5.6+5.62×5.6,
=(4.38+5.62)×5.6,
=10×5.6,
=56;

(3)

11
10

-

1
4

-

3
4

+

9
10


=(

11
10

+

9
10

)-(

1
4

+

3
4

),
=2-1,
=1;

(4)

4
15

÷(

13
9

-

2
3

×

5
6

),
=

4
15

÷(

13
9

-

5
9

),
=

4
15

÷

8
9


=

3
10

计算,能简算的用简便方法计算.125×8.08 ...

125×8.08,
=125×8+125×0.08,
=1000+10,
=1010,
86×15-380,
=1290-380,
=910,
79×25+20×79+79×55,
=79×(25+20+55),
=79×100,
=7900,

3
7

×(

4
5

-

2
3


=

3
7

×(

12
15

-

10
15

),
=

3
7

×

2
15


=

2
35

7
13

×

8
5

÷

14
39


=

7
13

×

8
5

×

39
14


=

12
5


[

3
5

-(

3
4

-

2
5

)]÷4,
=[

3
5

+

2
5

-

3
4

]÷4.
=

1
4

×

1
4


=

1
16

375+450÷18×25 简便计算

375+450÷18×25
=375+25×18÷18×25
=375+25×25
=375+625
=1000

脱式计算,能简算的要简算. 1.69÷1.3+2.5×0.4  375+450

(1)1.69÷1.3+2.5×0.4,
=1.3+1,
=2.3;

(2)375+450÷18×25,
=375+25×25,
=375+625,
=1000;

(3)2×1.4+2×1.6,
=2×(1.4+1.6),
=2×3,
=6;

(4)83×102-83×2,
=83×(102-2),
=83×100,
=8300.

计算,能简算的用简便方法计算.3-(12.9-84×17) ...

3-(12.9-84×

1
7

),
=3-(12.9-12),
=3-0.9,
=2.1;
44.4×25,
=11.1×4×25,
=11.1×(4×25),
=11.1×100,
=1100;

40
13

×(26×

3
40

),
=

40
13

×

3
40

×26,
=6;
2-[

1
6

+(

3
4

-

7
10

)],
=2-[

1
6

+

1
20

],
=2-

13
60


=1

47
60

计算下面各题,能简算的用简便方法计算

1、12/7-3/5-5/7=1-3/5=2/5;

2、(5/6+2/4-1/2)x24/2=(5/6+1/2-1/2)x12=5/6x12=10;

3、3/8÷(36+2/6)x10/3=3/8÷5/6x10/3=3/8x6/5x10/3=3/2=1又1/2;

4、9/8x(15+1)=9/8x16=18;

5、5/6x18+5/6x3/25+9/10=15+1/10+9/10=15+10/10=15+1=16;

6、15x2/5+15x2/3=6+10=16.

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