K
Khách

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

17 tháng 10 2016

ta gọi số cần tìm là abcd , ta có :

abcd = abc x 10 + 8

hay cách khác : abc x 10 + d = abc x 10 + 8

vậy hàng đơn vị hay d = 8

abc x 10 + 8 = abc8 

a000 + b00 + c0 = a000 + b00 + c0 + 8 - 8 

cùng gạch đi a000 và b00 ở hai biểu thức , tiếp theo , ta còn

c0 + 8 = c0 + 8 = c x 10 + 8 

cùng gạch đi c0 + 8 ở hai biểu thức , vậy đã hết , suy ra acb có thể là bất cứ số nào có 3 chữ số

15 tháng 6 2020

sao chị ơi, baid nài cứ như dạng toán lớp 4 ý. Y như bài của toán nâng cao của  em !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

1 tháng 7 2016

 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!!!

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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7 tháng 8 2016

Gọi số cần tìm là abcd (số đại số-có gạch ngang trên đầu í ^^).Khi đó ta cos1000a+100b+10c+d-(10a+b)=4455 hay 99(10a+b)+(10c+d)=4455 (1)
Suy ra 10c+d chia hết cho 99,tức là số đại số cd chia hết cho 99 =>c=d=9.Khi đó (1) trở thành 10a+b=44 hay số đại số ab=44 =>a=b=4.
Vậy số cần tìm là 4499.

7 tháng 8 2016

gấp thì gấp nè :

4500

chuẩn 1000% luôn ( lý do : 4500 - 45 = 4455 )

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

26 tháng 8 2021

1, 

gọi ab là số cần tìm (a khác 0)

gọi a0b là số ab sau khi thêm 0 vào chính giữa

gọi 1a0b là số a0b sau khi thêm 1 vào bên trái

ta có:

ab x 10=a0b

(ax10+bx1)x10=a0b

ax100+bx10=ax100+bx1

bx10=b(cùng trừ 2 vế cho a*100)

vì b x10=b nên b chỉ có thể là 0

vì b=0 nên ab=a0 và a0b=a00

ta lại có : a00x 3=1a00 

a00 x 3=1000+a00

a00 x 2=1000(cùng trừ hai vế cho a00)

a00=1000:2

a=5

Vậy ab = 50 

18 tháng 10 2016

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 ! 

18 tháng 10 2016

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