Selena có 4 khối lập phương y hệt nhau. Cô ấy muốn ghép chúng lại thành một hình hộp chữ nhật có diện tích toàn phần kí hiệu là S. Nếu giá trị nhỏ nhất của S là 288cm2 , hãy tìm giá trị lớn nhất của S. giải thích giúp mình. mình cảm ơn
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1. To Hoai wrote the story.
The story was written by To Hoai
2. The waiters cleaned the room last week.
The room was cleaned by the waiters last week
3. I met the boy yesterday.
The boy was met by me yesterday
4. They caught the elephant again.
The elephant was caught again
5. She bought the watch at the shop.
The watch was bought at the shop
6. They built the house in 2018.
The house was built in 2018
7. I watched the film last year.
The film was watch last year
8. We did the exercises last week.
The exercises were done by us last week
9. The pupil sent the letters the day before yesterday.
The letters were sent by the pupil the day before yesterday
10. He learned the lesson two weeks ago.
The lesson was learned by him two weeks ago
Here are the answers based on the passage:
Where is Michael's school?
How long does it take him to go to school?
What time do his classes end?
What does he do in the afternoon?
What time does he go to bed?
1 It is in California
2 It takes him 15 minutes to go to school
3 They end at 11:15
4 He plays sports and learns music
5 He goes to bed at 10
1. Line 1: "In England, when the school children come to school, they first go to the cloakroom."
- Redundant word: "school" (appears twice in the line)
2. Line 2: "They are take off their coats and raincoats, their caps and hats, and then go to their classroom."
- Redundant word: "are" (the correct phrase should be "They take off their coats...")
3. Line 3: "Some of the students go for to the laboratories and workshop where they learn in physics, chemistry, and art."
- Redundant word: "for" (the correct phrase should be "go to the laboratories...")
4. Line 4: "When a students is on duty, he comes to school very early."
- Redundant word: "a" (should be "When a student is on duty...")
5. Line 5: "He or she has to open all the window, water in the flower and clean the blackboard, so all everything is ready."
- Redundant word: "all" (should be "so everything is ready.")
line 1: school (1)
line 2: are
line 3: their
line 4: for
line 5: in
line 6: students => student
line 7: very
line 8: in
line 9: all
line 10: to
a)theo đề bài ra,ta có :
oa=3cm;ob=6cm
mà a và b nằm trên cùng 1 tia õ
suy ra a nằm giữa o và b
vậy ab =ob-oa=3cm
b)tacó a nằm giữa o và b
mà oa=ab=3cm
suy ra a là trung điểm của ob
c)đề cứ sai sai s lại b =2 cm nhỉ?
5.32 - 4.23 + 35: 7
=5.9 - 4.8 + 5
= 45 - 32 + 5
= (45 + 5) - 32
= 50 - 32
= 18
Số tiền 40 quyển vở và 8 bút chì là :
\(40.7000+8.3500=308000\left(đồng\right)\)
Số tiền 12 bút bi :
\(350000-308000=42000\left(đồng\right)\)
Số tiền 1 bút bi là :
\(42000:12=3500\left(đồng\right)\)
Đáp số...
Giải:
Số có hai chữ số có dạng: \(\overline{ab}\)
Khi viết thêm chữ số 0 vào giữa hai chữ số của số đó ta được số mới: \(\overline{a0b}\)
Theo bài ra ta có:
\(\overline{a0b}\) = \(\overline{ab}\) x 10
a x 100 + b = a x 10 x 10 + b x 10
a x 100 + b - a x 100 - b x 10 = 0
(a x 100 - a x 100) + ( b - b x 10) = 0
0 + 9b = 0
b= 0
Vậy(a; b) = (1; 0); (2; 0); (3; 0); (4; 0); (5; 0); (6; 0);(7; 0); (8; 0); (9; 0)
Vậy \(\overline{ab}\) = 10; 20; 30; 40; 50; 60; 70; 80; 90
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