K
Khách

Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.

1 tháng 7 2016

 Gọi các chữ số hàng nghìn , trăm , chục , đơn vị lần lượt là abcd

Theo đề bài ta có:abcd = 1188+ab

Trong phép cộng, khi cộng 2 chữ số trong cùng một hàng thì có nhớ nhiều nhất là 1 nên ab chỉ có thể là 11 hoặc 12 

Nếu ab = 11 thì abcd =1188 + 11 = 1199

Nếu ab = 12 thì abcd = 1188 + 12 = 1200

Vậy ta tìm đc 2 số thỏa mãn đề bài là : 1199 và 1200

Đs:1199 và 1200

Nhớ k mk nhe!!!

18 tháng 10 2016

gọi số cần tìm là abcd .

ta có :

ab + 1188 = abcd

ab + 1188 = ab x 100 + cd

1188 + cd = ab x 99

suy ra ab = 12

và cd = 00

đ/s : 1200

nhé ! 

18 tháng 10 2016

Gọi số phải tìm là abcd. Xoá đi chữ số hàng chục và hàng đơn vị ta được số ab

Theo đề bài ta có : abcd – ab = 4455 

100 x ab + cd – ab = 4455

cd + 100 x ab – ab = 4455 

cd + 99 x ab = 4455

cd = 99 x (45 – ab) 

Ta nhận xét tích của 99 với 1 số tự nhiên là 1 số tự nhiên nhỏ hơn 100. Cho nên 45 – ab phải bằng 0 hoặc 1. 

- Nếu 45 – ab = 0 thì ab = 45 và cd = 0. 

- Nếu 45 – ab = 1 thì ab = 44 và cd = 99.

Số phải tìm là 4500 hoặc 4499

7 tháng 12 2018

xóa chữ số hđv thì số đó giảm 10 lần

số ban đầu là: 1188:(10-1)=132

đáp số:...

mk nghĩ bài này chỉ tìm dc số có 3 chữ số thôi, k mk nhé

7 tháng 12 2018

16383

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22 tháng 5 2018

Bài giải 

Gọi số phải tìm là abcd. Xoá đi chữ số hàng chục và hàng đơn vị ta được số ab
Theo đề bài ta có : abcd – ab = 4455 
100 x ab + cd – ab = 4455
cd + 100 x ab – ab = 4455 
cd + 99 x ab = 4455
cd = 99 x (45 – ab) 
Ta nhận xét tích của 99 với 1 số tự nhiên là 1 số tự nhiên nhỏ hơn 100. Cho nên 45 – ab phải bằng 0 hoặc 1. 
- Nếu 45 – ab = 0 thì ab = 45 và cd = 0. 
- Nếu 45 – ab = 1 thì ab = 44 và cd = 99.
Số phải tìm là 4500 hoặc 4499

26 tháng 10 2023

Gọi số cần tìm là \(\overline{abcd}\) Theo đề bài

\(\overline{abcd}-\overline{ab}=1188\)

\(\Rightarrow100x\overline{ab}+\overline{cd}-\overline{ab}=1188\)

\(\Rightarrow99x\overline{ab}=1188-\overline{cd}\) (1)

Ta có

\(99x\overline{ab}⋮99\Rightarrow1188-\overline{cd}⋮99\)

Mà \(1188⋮99\Rightarrow\overline{cd}⋮99\Rightarrow\overline{cd}=0\)  hoặc \(\overline{cd}=99\)

+ Với \(\overline{cd}=0\) thay vào (1) \(\Rightarrow99x\overline{ab}=1188\Rightarrow\overline{ab}=1188:99=12\)

\(\Rightarrow\overline{abcd}=1200\)

+ Với \(\overline{cd}=99\) thay vào (1) \(\Rightarrow99x\overline{ab}=1188-99\Rightarrow\overline{ab}=11\)

\(\Rightarrow\overline{abcd}=1199\)

 

 

25 tháng 10 2023

gọi số cần tìm là abcd,ta có :

ab + 1188 = abcd

ab + 1188 = ab x 100 + cd

1188 + cd = ab x 99

suy ra ab = 12

và cd = 00

Vậy số đó = 1200

Học vv!