Đề ko rõ, ko yêu cầu phải làm gì

bài dễ quá đéo cần phải làm đâu ae ạ ! Có phải ko ae !đúng cho

ab x 4 + 14 = bab

Xét chữ số tận cùng b, ta có b x 4 + 4 = b => b = 2 (chỉ có mỗi giá trị 2 là thoả mãn)

Như thế a2 x 4 + 14 = 2a2

=>(10a + 2) x 4 + 14 = 200 + 10a + 2

=>40a + 8 + 14 = 200 + 10a + 2

=>30a = 180

=>a= 6

Vậy số ab = 62

a) 3,14159 làm tròn đến chữ số thập phân thứ 3 là:

Do phía sau số 1 là số 5 nên là làm tròn thành 3,142 

b) Làm tròn số 3,14159 với độ chính xác 0,5

Thì ta có: 3,14159 \(\approx\) 3,1 

a) 3,14159 làm tròn đến chữ số thập phân thứ 3 là:

Do phía sau số 1 là số 5 nên là làm tròn thành 3,142 

b) Làm tròn số 3,14159 với độ chính xác 0,5

Thì ta có: 3,14159 ➩ 3,1 

ab x 4 + 14 = bab 

ab x 4 +14= bx 100 + ab

ab x 3 + 14 = b x 100 

( a x 10 + b ) x 3 + 14 = b x 100

a x 30 +14=97

Nếu b = 1 thì a x 30+14=97

             ko tìm đc a

Nếu b =2 thì a x 30 +14 = 97 x 2

                    a x 30 + 14 = 194

                                     =  ( 194 - 14 ) : 30

                                      = 6

Vay a = 6 , b =2

1.Jim was absent from class yesterday because he was suffering from a bad cold.

2. They decided to move their house so that they don’t have to travel a long distance to work.

3. Mary hurt her fingers yesterday when she was preparing dinner.

4. At 4 pm yesterday, my mother was cleaning the house while I was looking after my younger brother.

5. They decided to go on an excursion because they want to get away from work stress.

6. I didn’t know how to use the computer before my father taught me how to use it.

7. I will call you as soon as I arrive at the station.

8. My brother is very out-going whereas I am quite reserved.

9. Mr. Peter was walking home when he was robbed of his wallet.

10. I don’t have a pet because my mother doesn’t allow me to have one.

1.Jim was absent from  class  yesterday. He was suffering from a bab cold.

Jim was... because he was...

2.They decided to move the house. They don’t have to travel a long distance to work.

They decided... so that they dont...

3.Mary heard her fingers yesterday.She was reparing dinner.

Mary hurt her... while she was...

4.At 4 pm yesterday, my mother was cleaning the house. I was looking after my younger brother.

At 4pm yesterday, my mom.... while I was...

5.They decided to go on an excursion. They want to get away from work stress.

They decided... because they want...

6.My father taught me how to use the computer. Before that, I didn’t know how to use it.

I hadnt know...use the computer untill my dad taught me

7.I arrive at the station. I will call you right after.

As soon as I arrive..., I will call u

8.My brother is very out-going. I am quiet reserved.

My bro... but I am...

9.Mr Peter was walking home.He was robbed of his wallet.

While Mr Peter was walking home, he was robbed of his wallet

10.I don’t have a pet. My mother doesn’t allow me to have one.

I don’t have a pet because my mother doesn’t allow me to have one