K
Khách

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

28 tháng 12 2015

Gọi số đó là a3c ( vì chữ số 3 ở hàng chục ). Nếu bớt chữ số 3 ở hàng chục đi thì còn lại số ac. Theo đầu bài ta có:
a3c = 9 * ac
Ta thấy a chỉ có thể là 1 vì nếu a là 2 thì 2 * 9 = 18 ( sai đề )
Thế a = 1 xong, ta lại có:
13c = 9 * 1c
Do 13c bằng một số nhân với 9 nên 13c phải chia hết cho 9.
Mà 9 = 1 + 3 + c => c = 5
Vậy số đó là 135.

27 tháng 5 2018

Gọi abc là số tự nhiên phải tìm.

Theo bài ra, ta có:

abc = bc x 9

100 x a + bc = bc x 9

100 x a = bc x 8

=> abc = 450

Tk mk nha!

27 tháng 5 2018

Gọi abc là số tự nhiên phải tìm

Theo đề bài ta có :

abc = bc x 9

100 x a + bc = bc x 9

100 x a = bc x 8

Suy ra : abc = 450

Đ/s :..............

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

20 tháng 2 2018

Gọi abcd là số cần tìm, vậy số mới là ab

Ta có: abcd = ab + 4455

  ab x 100 + cd = ab + 4455

ab x 99 + cd = 4455

ab x 99 + cd = 45 x 99 + 00

ab x 99 + cd = 44 x 99 + 99 

=> ab = 45 ; cd = 00

ab = 44 ; cd = 99 

  Vậy số cần tìm là 4500 và 4499

20 tháng 2 2018

Gọi số có 4 chữ số đó là abcd

Ta có : abcd = abc + 4455

abc x 10 + d = abc + 4455

abc x 10 - abc + d = 4455

abc x 9 + d = 4455

Ta thấy 4455 : 9 = 495 ( không dư )

=> d = 0 và abc = 495

Vậy số đó là 4950

Đúng 100% k tin bạn thử lại 

tích mk nha !!

19 tháng 2 2017

Khi xóa chữ số 3 ở hàng trăm của 1 số tự nhiên thì số đó giảm đi 300 đơn vị

<Bn tự vẽ sơ đồ>

Số ban đầu là:

300:(7-1)x7=350

k mik nha bn .chúc bn học giỏi

19 tháng 2 2017

số đó là 350

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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12 tháng 8 2015

bo chu so 1o hang nghin thi so cu hon so moi 1000 don vi

hieu so phan ban nhau la:

5-1=4(phan)

so moi la:

1000:4=250

vay so can tim la:1250