played

câu này có yesterday là quá khứ nên play phải chia

Gọi số cần tìm là abcde 

Số khi viết thêm chữ số 2 vào đằng sau là abcde2

Số viết thêm chữ số 2 vào đằng trước là 2abcde

Ta có :

2abcde x 3 = abcde2

( 200000 + abcde ) x 3 = abcde x 10 + 2

200000 x 3 + abcde x 3 = abcde x 10 + 2

600000 + abcde x 3 = abcde x 10 + 2

600000 - 2                = abcde x 10 - abcde x 3

599998                     = abcde x 7

abcde                       = 59998 : 7

abcde                       = 85714

→ Số cần tìm là 85714

chỗ 59998 : 7 mik vt nhầm 599998 : 7 nha

\(\Rightarrow\) You don't​ have to finish the work to day.

you don't have to finish the work to day.

what is your birthday

What is your date of birth?

a: Sửa đề: A=41,54-3,18+23,17+8,46-5,82-3,17

=(41,54+8,46)-(3,18+5,82)+23,17-3,17

=50-9+20

=61

b: Sửa đề: \(B=123,8-34,15-12,49-\left(58,5-2,49\right)+10,12\)

\(=123,8-34,15-12,49-58,5+2,49+10,12\)

\(=123,8-\left(34,15+58,5\right)-\left(12,49-2,49\right)+10,12\)

\(=133,92-90-10=132,92-100=33,92\)

cạnh x 4

mot cua hang ban 1 tam vai lam.3 lan lan thu nhat ban duoc 1/3tam vai va 4m. lan thu 2 ban duoc 1/2tam vai va them 2m.lan thu ba ban 18m vai thi het tam vai.hoi nguoi do ban bao nhieu m vai.neu 1m vai la 82000dong thi nguoi do ban duoc bao nhieu tien

Task 5: Circle the best option for each space to complete the following letter (5 pts)

            It’s Saturday morning. The Parkers are sitting in the living room. They are talking (1) ________ the dinner this evening. Peter likes beef and Susan does, too. He says that beef (2) ________ good for children. Their father, Mr. Parker, prefers chicken to beef. He asks his wife to buy some for him . Marry, their youngest daughter doesn’t want any meat. She would (3) ________ cakes and sweets. Mrs. Parker doesn’t like beef. She doesn’t like chicken, either. She likes fish, vegetables and fruit. She says that fish and vegetables are good for old men and everybody (4) ________ to eat fruit. At last, they decide to go out for dinner (5) ________ Mrs. Parker says that she can’t cook so much food for everybody in the family.

1.   A. with                  B. for               C. about                D. to

2.   A. are                   B. has                  C. does                D. is

3.   A. like                B. likes                   C. ha        D. has

4.   A. need                    B. needs       C. are                     D. have

5.   A. because                 B. but           C. so                  D. and

Tick mik nhé.

1. C. about - They are talking about the dinner. (This preposition indicates the topic of conversation)
2. B. is - He says that beef is good for children. (This refers to a general statement about the quality of beef)
3. A. like - She would like cakes and sweets. (This indicates her preference)
4. C. are - Everybody are recommended to eat fruit. (This is a passive voice construction suggesting a general recommendation)
5. B. but - At last, they decide to go out for dinner but Mrs. Parker says... (This indicates a contrast between their decision and the reason behind it)

Chịu 😢

lỗi câu hỏi rồi nhé.

(-_-)

a: Số giấy vụn lớp 6A thu được là:

\(1035\cdot\dfrac{1}{3}=345\left(kg\right)\)

b: Tỉ số phần trăm giữa số giấy vụn lớp 6A thu được so với toàn khối là:

\(\dfrac{1}{3}\simeq33,3\%\)

@Nguyễn Lê Phước Thịnh lm nhanh quá ạ!

Gọi d=ƯCLN(12n+1;30n+2)

=>\(\left\{{}\begin{matrix}12n+1⋮d\\30n+2⋮d\end{matrix}\right.\)

=>\(\left\{{}\begin{matrix}60n+5⋮d\\60n+4⋮d\end{matrix}\right.\)
=>\(60n+5-60n-4⋮d\)

=>\(1⋮d\)

=>d=1

=>\(\dfrac{12n+1}{30n+2}\) là phân số tối giản

Lời giải:
Gọi $d=ƯCLN(12n+1, 30n+2)$

$\Rightarrow 12n+1\vdots d; 30n+2\vdots d$

$\Rightarrow 5(12n+1)-2(30n+2)\vdots d$

$\Rightarrow 1\vdots d\Rightarrow d=1$

Vậy $12n+1, 30n+2$ nguyên tố cùng nhau

$\Rightarrow \frac{12n+1}{30n+2}$ là phân số tối giản.