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10 tháng 12 2017

= 12 . (55+45)

= 12.100

=1200

10 tháng 12 2017

12.55 + 12.45

= 12.(45+55)

= 12.100

= 1200

17 tháng 12 2016

a) = 648 + 1152 - 12,55 - 12,45

= 1775

b) = 16 : 2 + 25 . 3 - 29

    = 8 + 75 - 29

    = 54

7 tháng 1 2018

1. thực hiện phép tính

a. 75-(3. 52 - 4. 23)

= 75-(3. 25 - 4. 8)

= 75 - (75- 32)

= 75 - 43

= 32.

b. 18: 32 +5.23 -27

= 18 : 9 + 5. 8 -27

= 2 + 40 - 27

= 42 - 27

= 15.

c. -12+34 = +(34 - 12) = 22.

d. 50.25+50.75-200

= 50. (25 + 75) - 200

= 50. 100 - 200

= 5000 - 200

= 4800.

e. -35+34+(-25)+16

= [-35 + (-25) ] + (16 + 34 )

= -60 + (16 + 34 )

= -60 + 50

= -10.

f. 27.75+28.75-270

= (27+28) . 75 - 270

= 55. 75 - 270

= 4125 - 270

= 3855.

g. 18.36+18.64-12.55-12.45

= 18 . (36+64) - 12. (55-45)

= 18 . 100 - 12. 10

= 1800 - 120

= 1680.

19 tháng 12 2023

12,45 : 0,25 + 1,6 x 0,25 : 0,125 + 50 : 0,5

= 12,45 x 4 + 1,6 x 0,25 x 8 + 50 x 2

= 49,8 + 3,2 + 100

= 53 + 100

= 153 

18 tháng 4 2017

16,34-12,45+8,45 = 12,34 . k mình nha

18 tháng 4 2017

544-540+360=364

25 tháng 12 2016

(1) zn + h2so4 -> znso4 + h2

nH2 = v/22.4 =3.36/22.4 = 0.15 mol

theo phương trình (1) nZn=nH2=0.15 mol

=> mZn = n.M = 0.15.65 = 9.75 g

=> mCu = mhh - mZn =12.55 -9.75=2.8 g

=> khối lượng chất rắn còn lại sau phản ứng là 2.8 g

 

25 tháng 12 2016

Cảm b nha

 

21 tháng 1 2018
a.0,24 b.12,34 c.3,75
29 tháng 6 2020

Thời gian ô tô đi từ A đến B là:

12 giờ 45 phút - 5 giờ=7 giờ 45 phút 

7 giờ 45 phút = 7,75 (giờ )

Quãng đường AB là :

48 x 7,75=372(km)

Đáp số : 372km

29 tháng 6 2020

Thời gian ô tô đi là:

12giờ 45phút - 5giờ=7giờ 45phút=7,75 giờ

Quãng đường AB dài là:

48x7,75= 372(km)

Đ/S: 325 km

k cho mik nha

Last tuesday dick went to Bristol. The train got intro Temple Mead at 12.45. Rosemary, his close friend met him outside the station. First, they went to a small cafe to have a cup of coffee. They talked endlessly. Then they walked around for a while, and finally went to Rosemary's house. They had a lovely lunch. Dick met Rosemary's mother and later her two childen when they when they went home from school. In the evening, he went to see a very interesting film with Rosemary's family. After the...
Đọc tiếp

Last tuesday dick went to Bristol. The train got intro Temple Mead at 12.45. Rosemary, his close friend met him outside the station. First, they went to a small cafe to have a cup of coffee. They talked endlessly. Then they walked around for a while, and finally went to Rosemary's house. They had a lovely lunch. Dick met Rosemary's mother and later her two childen when they when they went home from school. In the evening, he went to see a very interesting film with Rosemary's family. After the show, he said goodbye to them and left for London.

1. How did Dick go to Bristol last Tuesday?

..........................................................................................................................

2. What time did the train arrive at Temple Mead?

............................................................................................................................

3. Whom did Dick meet ai Rosemary's house?

..............................................................................................................................

4. Did he watch an interesting film with Rosemary's family?

................................................................................................................................

5. When did Dick leave for LonDon?

.................................................................................................................................. 

2
26 tháng 4 2022

1. How did Dick go to Bristol last Tuesday?

.............By train.............................................................................................................

2. What time did the train arrive at Temple Mead?

................At 12.45............................................................................................................

3. Whom did Dick meet ai Rosemary's house?

................Her mom..............................................................................................................

4. Did he watch an interesting film with Rosemary's family?

............Yes, he did....................................................................................................................

5. When did Dick leave for LonDon?

.............After the show.....................................................................................................................

26 tháng 4 2022

Last Tuesday dick went to Bristol. The train got into Temple Mead at 12.45. Rosemary, his close friend met him outside the station. First, they went to a small cafe to have a cup of coffee. They talked endlessly. Then they walked around for a while, and finally went to Rosemary's house. They had a lovely lunch. Dick met Rosemary's mother and later her two children when they when they went home from school. In the evening, he went to see a very interesting film with Rosemary's family. After the show, he said goodbye to them and left for London.

1. How did Dick go to Bristol last Tuesday?

.............He went by train...........................................................................

2. What time did the train arrive at Temple Mead?

.............The train got there at 12.45..........................................................

3. Whom did Dick meet at Rosemary's house?

.............He met Rosey’s mother and her two children............................

. Did he watch an interesting film with Rosemary's family?

..............Yes, he did....................................................................................

5. When did Dick leave for London?

..............He left London after the show.....................................................