Gọi số cần tìm là ab (a khác 0; a,b là các chữ số)

Ta có:

ab : b = b (dư a)

=> ab = b x b + a

=> 10 x a + b = b x b + a

=> 10 x a - a = b x b - b

=> a x 9 = b x (b - 1)

Mà a là chữ số => a = 8

=> b = 9

Vậy số cần tìm là 89.

Chuyển từ Trực tiếp sang Gián tiếp và gián tiếp sang trực tiếp

1.She asked why they took a taxi to that place

=>

2."Who do you live with now ?"

=> He ashed us

3."Please,help me with my problem?"

=>

4.They asked us how many floors that school haduntil we studied

=> They asked us

5."This is my best subject at this school"

=>Jame said

Dựa vào hóa trị của các nguyên tố sau, hãy cho biết công thức hóa học nào đúng, công thức hóa trị nào là sai và sửa lại

\(Fe_2O_3;CO_3;AlS;S_2O_3;MgO;N_2O_3;CaCl;HCl_3;N_5O_2\)

Nếu CTHH nào sai mọi người giải thích hộ e 2 cái nha !

Thanks nhiều ạ:)

Dựa vào hóa trị của các nguyên tố,hãy cho biết công thức hóa học nào sai trong các công thức sau đây:

CaCl₂;HCl₂;Fe₂O₃;Na₂O₃;CO₂;CO₃;SO₂;SO₃

1."What date is it today".Teacher asked us

=>

2""Is your house near here".I asked him

=>

3."I am the youngest in my family".She asked me

=>

4."I can't do my homework so my mom help me".He said

=>

5.What is your favorite subject at school"They asked us

=>

6"Who is this".They asked them

=>

7"Are there four people in your family"MR.Tam asked me

=>

8"When does your class start".I asked MR.Tam

=>

9"Next year,I will be 14^th".Lan said

=>

10"I will listen to your adrice".He said

=>

Chuyen cau truc tiep sang cau gian tiep

1

"What is your name ?" She asked me

2

"How old are you ?" I asked her

3

"Is your house big"She asked him

4

Where do you live" He asked us

5

"How often does your mom go to work" We asked her

6

"Do you give me your pen"She asked him

7

"Do you give me your pen"He asked her

8

"Do you give me your pen"She asked us

9

"How many rooms do you have" We asked them

10

How many rooms are there in your house"They asked me

Chuyển câu trực tiếp sang câu gián tiếp

1

"Is your house near my house" She asked him

2

"Is your house near my house" He ashed me

3

Can you explain your answer for me"I asked her

4

"Does your mom go out with you"She asked us

5

"Is your son tall or short" We asked them