知识大全 计算(能简算的要简算,并写出简算过程).(23+215)×45 (100-19)÷(1.63+1.07) 18.7-3.375-6.

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计算(能简算的要简算,并写出简算过程).(23+215)×45 (100-19)÷(1.63+1.07) 18.7-3.375-6.

①(

2
3

+

2
15

)×45,
=

2
3

×45+

2
15

×45,
=30+6,
=36;

②(100-19)÷(1.63+1.07),
=81÷2.7,
=30;

③18.7-3.375-6.625,
=18.7-(3.375+6.625),
=18.7-10,
=8.7;

④6+

2
3

÷

1
3

×

3
4


=6+

2
3

×3×

3
4


=6+

3
2


=

15
2

计算题。 能简算就简算,并写出简算过程。

(1)=6.7×﹙6.7+2.3+1﹚
=6.7×10
=67
(2)=0.65×(14+87-1)
=0.65×100
=65
(3)=2/3×24-1/2×24+1/6×24
=16-12+4
=8
望采纳.谢谢

能简算的简算、主要写出简算过程

8*1.25+0.8*1.25*0.08*1.25=11.1
2. (96+1)(2008-1)-96*2008=96*2008+2008-96-96*2008=1912
3. =(0.25+0.75)÷(2.5*0.4+1.8÷1.8)=1÷2=0.5
4.(132+127)*29+(37+34)*259=259*29+71*259=259*(29+71)=25900
5.=1/12/5/12-1/4/5/12-1/5=□-2/3
=0.2+0.6-0.2=□-2/3
3/5+2/3=□
□=19/15
6.慢车速度是快车的3/4,说明慢车速度和快车的比是3:4
在时间相等的情况下,速度与路程成正比
所以路程比也是3:4
在离中点5千米处相遇,说明,快车比慢车多走了:5×2=10千米
相遇时快车行驶:10÷(4-3)×7=70千米
路程=(70-5)*2=130千米
7.设百位数子为X
X+3/2X+(2X-1)=17
X=4
4*3/2=6
2*4-1=7
准考证号是476

脱式计算(能简算的要简算,并写出主要过程)125×45×16 0.4÷23+1.6÷...

①125×45×16  
=(125×8)×(45×2)
=1000×90
=90000

②0.4÷

2
3

+1.6÷

2
3

=(0.4+1.6)×

3
2

=2×

3
2

=3

4
5

×

2
7

+

1
5

÷

3
21

=

4
5

×

2
7

+

1
5

×7
=

8
35

+

49
35

=

57
35

④5.6×

3
8

+0.375×5.4-37.5%  
=5.6×0.375+0.375×5.4-0.375
=0.375×(5.6+5.4-1)
=0.375×10
=3.75  
      
⑤21-(

3
7

+

1
3

)×

5
16

=21-

16
21

×

5
16

=21-

5
21

=20

16
21

简算,并写出简算过程。

23-12/17-5/17
=23-1
=22
44×(5/11+3/4)
=44×5/11+44×3/4
=20+33
=53
7.5×46.7+52.3×7.5+7.5
=7.5×(46.7+52.3+1)
=7.5×100
=750

脱式计算,能简算的要写出简算过程. (8-10× 4 5 )÷ 1 5 19-19× 1

(1)(8-10×

4
5

)÷

1
5

=(8-8)÷

1
5


=0÷

1
5


=0;

(2)19-19×

19
20

=(1-

19
20

)×19,
=

1
20

×19,
=

19
20

(3)

5
11

-0.8+

6
11

=

5
11

+

6
11

-0.8,
=1-0.8,
=0.2;

(4)35÷[(

5
6

?

2
3

)×3]
=35÷[

1
6

×3],
=35÷

1
2


=70.

能简算的要简算,并写出简算过程.(1)[5.3-(4.98-5710)-1150]÷25% &n...

(1)[5.3-(4.98-5

7
10

)-1

1
50

]÷25%,
=[5.3-(4.98-5.7)-1.02]÷0.25,
=[5.3-4.98+5.7-1.02]÷0.25,
=[5.3+5.7-(4.98+1.02)]÷0.25,
=[11-6]÷0.25,
=5÷0.25,
=20;

(2)1999÷1999

1999
2000


=1999÷

1999×2000+1999
2000


=1999×

2000
1999×2000+1999


=1999×

2000
1999×(2000+1)


=

2000
2001

(3)48%÷[3-(5.55×1

2
5

-2.1÷

2
5

)],
=0.48÷[3-(5.55×

7
5

-2.1×2.5)],
=0.48÷[3-(7.77-5.25)],
=0.48÷[3-2.52],
=0.48÷0.48,
=1;

(4)3

4
5

×1234+7777÷

35
186

+543.2×38,
=3.8×1234+7777×

186
35

+5432×3.8,
=(1234+5432)×3.8+1111×

186
5


=6666×3.8+1111×37.2,
=1111×6×3.8+1111×37.2,
=1111×(22.8+37.2),
=1111×60,
=66660.

递等式计算.(能简算的要简算,并写出主要的简算过程)①79+38+58+29 &nb...

7
9

+

3
8

+

5
8

+

2
9


=(

7
9

+

2
9

)+(

3
8

+

5
8

),
=1+1,
=2;

3
5

÷[1-(

1
5

-

1
10

)],
=

3
5

÷[1-

1
10

],
=

3
5

÷

9
10


=

2
3


③0.7×1.25×8,
=0.7×(1.25×8 ),
=0.7×10,
=7;
④(4.2-3.52÷1.6)×1.5,
=(4.2-2.2)×1.5,
=2×1.5,
=3;
⑤2.5×99+2.5,
=2.5×(99+1),
=2.5×100,
=250.

计算,能简算的要简算,并写出主要主要过程。

(1)9分之7+8分之3+8分之5+9分之2
=(7/9+2/9)+(3/8+5/8)
=1+1
=2

(2).0.7×1.25×8
=0.7x10
=7

(3)(4.2-3.52÷1.6)×1.5
=(4.2-2.2)x1.5
=2x1.5
=3

(4)2.5×99+2.5
=2.5x(99+1)
=2.5x100
=250

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