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7,429 has 4 digits
it: 7, 4, 2, 9
264 has 3 digits
it: 2, 6, 4
1. There are four digits in the number 7,429.
2. They are seven, four, two and nine in the number 7,429.
3. The number 7,429 is odd. Because the number end in 9.
4. There are three dgits number in the number 264.
5. They are two, six and four in the number 264.
6. The number 264 is even. Because the number end in 4.
Vãi There are a total of $8\times 7\times 6\times 5\times 4=67,\!200$ ways to form a 5-digit number with distinct digits out of 0, 1, 2, 3, 4, 5, 6, 7. We claim that these can be grouped into $\binom{5}{2}\cdot 2=20$ pairs, where each pair adds up to 7777. The pairs are $(0, 7777), (1, 7776), \ldots, (4, 7773)$ and $(5, 7772), \ldots, (7, 7770)$. Thus, the sum of all the possible numbers is $20\cdot 7777=\boxed{155,540}.$ đó ko biết đúng hay sai nhé
1. buying→to buy
2. rides→is riding
3. some→any
4. many→much
5. chocolates→chocola
6. are→is
7. younger→youngest
8. the→∅
9. of→about
10. smallest→smaller
11. french→france
12. is→is the
13. shopping→to shop
14. this→∅
15. to→∅
61. How many childs does your mother have?
A. many B. childs C. does D. have
62. There is many good restaurants and amusement parks in our neighborhood.
A. There is B. restaurants C. and D. in
63. He must makes his bed after he wakes up every day.
A. makes B. bed C. wakes up D. every day
64. She always give presents to her parents on Tet holiday.
A. give B. to C. her D. on
65. You must walk on grass when you see the sign “No walking”.
A. must B. on C. see D. the sign
66. Shall we having a picnic by the sea tomorrow?
A. Shall B. having C. a D. by
67. This movie is worser than that one.
A. This B. is C. worser D. one
68. Ha Long Bay is one of the much natural wonders in Viet Nam.
A. is B. of C. much D. natural wonders
69. In my opinion, city life is as exciting than country life.
A. In B. city life C. as D. exciting
70. They are healthy because they play yoga every day.
A. are B. healthy C. because D. play
III. Choose the underlined part that needs correction in each of the following questions.
61. How many childs does your mother have?
A. many B. childs=> children C. does D. have
62. There is many good restaurants and amusement parks in our neighborhood.
A. There is => there are B. restaurants C. and D. in
63. He must makes his bed after he wakes up every day.
A. makes=> make B. bed C. wakes up D. every day
64. She always give presents to her parents on Tet holiday.
A. give => gives B. to C. her D. on
65. You must walk on grass when you see the sign “No walking”.
A. must=> must not B. on C. see D. the sign
66. Shall we having a picnic by the sea tomorrow?
A. Shall B. having=> have C. a D. by
67. This movie is worser than that one.
A. This B. is C. worser=> worse D. one
68. Ha Long Bay is one of the much natural wonders in Viet Nam.
A. is B. of C. much=> best D. natural wonders
69. In my opinion, city life is as exciting than country life.
A. In B. city life C. as=> more D. exciting
70. They are healthy because they play yoga every day.
A. are B. healthy C. because D. play => do
11 số nguyên dương liên tiếp được viết trên bảng. Maria xóa một trong những số. Nếu tổng 10 số còn lại là 2012, Maria xóa số nào?
Bài giải:
Gọi số đầu tiên là a thì 11 số liên tiếp là a + 1 đến a+ 10
tổng của 11 số đó là 11 a + 55
Vì tuấn xóa đi 1 số nên tổng của 10 số sẽ thuộc [10a + 45 , 9a + 55]
..........
Mik làm mới đến chỗ nầy thôi bạn tự làm tiếp nhé!
Bạn ơi!Bạn dựa theo bài này mà làm nhé! ............. Hok Tốt nhé ..............
Tuấn xoá đi 1 trong 10 số nguyên
dương liên tiếp. Tổng của 9 số
còn lại bằng 2006. Hỏi Tuấn đã
xoá đi số nào?
gọi số đầu tiên là a thì 10 số liên tiếp là a + 1 đến a+ 9
tổng của 10 số đó là 10a + 45
vì tuấn xóa đi 1 số nên tổng của 9 số sẽ thuộc [9a+36 , 9a + 45]
ta có 2006 = 9.222 + 8 = 9.218 + 44 => a = 218 => số đã xóa là 218 .10 + 45 - 2006 = 219
1. How many classes does your school ?
2. Linda has many lots of friends because she friendly .
3. James smokes but his brother doesn't
1. How many teachers are there in your school?
=> How many teachers does ......................................your school have?..........................................................................
2. The photocopy store is to the left of the movie theater.
=> The movie theater is…….………………is to the right of the photocopy store………………………….………………..……….……
3. Ho Chi Minh City is bigger than Ha Noi.
=> Ha Noi ………………….……is not as big as HCMC…..…………………………………..……………..………….….
4. Dung is Mrs. Hoa’s granddaughter.
=> Mrs. Hoa……………………is Dung's grandmother ..………………………………………………………..……….…..
5. Why don’t we go to the movies tonight?
=> What ...................................about going to the movies tonight?.............................................................................................................
6. What is the price of this dictionary?
=> How............................does this dictionary cost?.....................................................................................................................
7. What’s your favorite drink?
=> What drink………………do you like most?…………………………………………………………...……………
8. Nobody in my class is taller than Hieu.
=> Hieu……………is the tallest in my class……………………………………………………………….…………....…….
9. Dr. Kim drives his car to work every morning.
=> Dr. Kim goes.............................to work by car every morning.......................................................................................................
10. The subject Nam likes most at school is English.
=> Nam’s …………………………favorite subject is English…………………………………………………………………...
11. In spite of taking a taxi, he arrived late for the meeting.
- Although ________he took a taxi, he arrived late for the meeting_________________________ .
12. It is such a heavy box that I can't carry it.
- The box is ______so heavy that I can't carry it_____________________________ .
223 nha bạn chắc chắn lun đó
cho mk 1 ik nha
223 nha bạn chắc chắn lun đó
cho mk 1 ik nha