Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Giải
Số đó là số 26.
Khi bỏ số ở hàng đơn vị đi thì số đó là 2 mà 2 x 13 = 26.
==》 Số đó là 2.
Số đó là số 26.
Khi bỏ số ở hàng đơn vị đi thì số đó là 2 mà 2 x 13 = 26.
==》 Số đó là 2.
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
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
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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