K
Khách

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

5 tháng 12 2017

                                                                                                  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.

5 tháng 12 2017

                                                                                                       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.

27 tháng 9 2017

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 :)))))

24 tháng 5 2018

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

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 6 2018

Gọi số cần tìm là abcd. Xóa 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

ad + 100 x ab - ab = 4455

cd + 99 x ab = 4455

cd = 99 x ( 45 - ab )

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

Nếu 45 - ab = 0 thì ab = 45 và cd = 0

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

=> Số cần phải tìm là 4500 hoặc 4499

22 tháng 6 2018

Theo đề bài ra, ta có:

ab = 5 x ( a + b )

Vì 5 x (a+b) có tận cùng bằng 0 hoặc 5 nên b = 0 hoặc = 5

nếu b = 0, thay vào ta có:

a5 = 5 x (a+5)

10 x a + 5 =  5 x a + 25

tính ra được a = 4

thử lại: 45 : (4+5) = 5.

=> số đó là 45