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 ! 

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

Ta có 1188 + ab= abcd

Nếu ờ hàg chục là phép cộg k nhớ thì ab = 11, suy ra cd là 99. Số 1199.

Nếu ở hàg chục là phép cộg có nhớ thì ab = 12, suy ra cd là 00. Số 1200

các bạn giúp mình giải nha.mình xin cảm ơn các bạn đã giúp mình

bạn vào câu hỏi tương tự nha !!!!!!!!!!!!

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

16383

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bạn muốn chép trên này hả Nguyễn Tuấn Anh lớp 5a ?

 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!!!

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) \(\Rightarrow99x\overline{ab}=1188-99\Rightarrow\overline{ab}=11\)

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

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!

 Ta có 1188 +ab= abcd(đặt tính theo cột dọc nha).

Nếu ờ hàg chục là phép cộg k nhớ thì ab = 11, suy ra cd là 99.

Số 1199. Nếu ở hàg chục là phép cộg có nhớ thì ab = 12, suy ra cd là 00. Số 1200