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Khách

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

14 tháng 2 2023

Gọi số có 4 chữ số cần tìm là \(\overline{abcd}\)

Theo đề ra, ta có: Khi xóa đi chữ số hàng chục và hàng đơn vị ta được số \(\overline{ab}\)

\(\overline{abcd}-\overline{ab}=3663\)

\(\overline{ab}\times100+\overline{cd}-\overline{ab}=3663\)

\(\overline{ab}\times99+\overline{cd}=3663\)

\(\overline{cd}=99\times\left(37-\overline{ab}\right)\)

Mà tích của 99 là một số tự nhiên bé hơn 100 nên có hai trường hợp là \(37-\overline{ab}=0\) hoặc \(37-\overline{ab}=1\)

Trường hợp 1: \(37-\overline{ab}=0\Rightarrow\overline{ab}=37\)

\(\Rightarrow\overline{cd}=0\)

Trường hợp 2: \(37-\overline{ab}=1\Rightarrow\overline{ab}=36\)

\(\Rightarrow\overline{cd}=99\)

Vậy số tự nhiên có 4 chữ số cần tìm là \(3700;3699\).

Gọi số cần tìm là \(\overline{abcd}\)

Xóa đi chữ số hàng chục và hàng đơn vị ta được số ab

Theo bài ra ta có: 

\(\overline{abcd}-\overline{ab}=3663\)

\(100.ab+cd-ab=3663\)

\(cd+100.ab-ab=3663\)

\(cd+99.ab=3663\)

\(\Rightarrow cd=99.\left(37-ab\right)\)

\(\Rightarrow37-ab=0\) hoặc \(37-ab=1\)

Nếu 37 - ab = 0 thì ab = 37 và cd = 00

Nếu 37 - ab = 1 thì ab=36 và cd = 99

Vậy số cần tìm là: 3700 và 3699

24 tháng 7 2016

đáp án : 3700 , 3699

24 tháng 7 2016

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758645

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fd

fg

g

g

g

g

g

g

g

g

g

g

g

g

g

yh

u

yt

tu

yt

eawr

we

r

tt

ryh

fyu

gfykhj

k

j

lhj

gi8

et

e

rsdth

dfyg

hndf

jfh

frghy

fg

h

f

j

fh

f

g

d

gf

h

fh

dhfg

dfhf

tr;dg

dg

g

fh

g

hg

g

gh

gg

h

hg

hg

h

t

t

t

t

t

sd

d

xdf

ghf

j

ghu

i

tfr

cxf

j

udse5ytr

77es

5

65

6

t

frf

g

c

g

tr

yt

f

v

g

v

tf

,

tfv

j

f

b

t

b

hy

n

gh

g

g

g

g

gf

41

4

4

2

42

24

24

24

24

24

2

5

2

24

44

2

45

452

2

12

2

2

22

4

1

24

4

4

5

42

4

14

2

42

24

25

4

4

44

5

tyhyf

tghy

f

h

fgh

dg

hg

fj

gh

k

jj

j

j

j

j

j

j

j

j

j

j

j

j

j

j

j

j

j

j

j

j

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

10 tháng 6 2015

Gọi số cần tìm là abcd. Xóa đi chữ số hàng chục và đơn vị ta được số ab

Ta có :

abcd - ab = 3663

ab x100 + cd -ab = 3663

cd + ab x100 - ab = 3663

cd + ab x 99         = 3663

             cd           = 3663 - ab x99

             cd           = 37 x 99 - ab x 99

             cd           = (37- ab) x 99

Nhận xét : Tích của 99 với 1 số tự nhiên là một số bé hơn 100 nên 37 - ab phải = 0 hoặc1

Nếu 37 - ab = 0 thì ab = 37 và cd = 00

Nếu 37 - ab = 1 thì ab  = 36 và cd = 99

Vậy số cần tìm là 3700 hoặc 3699

3700 hoac 3699 ban a

19 tháng 3 2016

nếu ta xóa đi chữ số hàng chục và hàng đơn vị của số đó đi thì số đó giảm đi 100 lần và giá trị của số hàng chục và hàng đơn vị ghép lại

Vậy giá trị đó là : 1983 : (100 - 1 ) = 20 dư 3 

Vậy giá trị của  số hàng chục và hàng đơn vị ghép lại là 03

Số đó là : (1983 - 3 ) : 99 x 100 + 3 =2003

Đáp số : 2003

10 tháng 3 2017

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 h
ơn 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.

27 tháng 11 2019

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 × ab + cd – ab = 4455
cd + 100 × ab – ab = 4455
cd + 99 × ab = 4455
cd = 99 × (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

31 tháng 3 2018

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.

17 tháng 9 2016

tự trả lời à bạn !!!

S
17 tháng 9 2016

Đề bài:
Cho số có 4 chữ số . Nếu ta xoá đi chữ số hàng chục và hàng đơn vị thì số đó giảm đi 4455 đơn vị. Tìm số đó.

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.