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

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

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

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!

Bài 1

a0b = ab x 7

a x 100 + b = ( a x 10 + b ) x7

a x 100 + b = a x 10 x 7 + b x 7

Cùng bớt đi b

a x 100 = a x 70 + b x 6

Cùng bớt đi a x 70

a x 30 = b x 6

Cùng chia cho 6 

a x 5 = b x 1

=>a = 1 ; b = 5

Vậy số đó là 15

2 bài kia bạn tự giải nha , mk lười lắm :)))))

cau hoi nay la cau hoi co 3 chu so chu khong hai la 2chu so

bài 2

Gọi số có 4 chữ số là : abcd

Nếu xóa chữ số hàng chục và đơn vị thì ta được số mới giảm đi 4455 đơn vị

=>  abcd - ab =4455

=> ab x 100 + cd -ab =4455

=>99×ab+cd=45×99

=>cd=45×99−99×ab

=>cd=99×(45−ab)

Ta có: cd<100 ab)<100⇒45−ab=1 hoặc 45−ab>

+Nếu 45−ab=0thì ⇒ab=45;cd=99×0=0⇒cd=00

+Nếu 45−ab=1⇒ab=44;cd=99×1=99

Vậy số cần tìm là 4500 hoặc 4499.