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22 tháng 12 2015

Gọi số đó là ab (a; b là chữ số ; a khác 0)

theo bài cho ta có: 

ab = 3ab

=> 10a + b = 3ab 

=> 10a - 3ab + b = 0 

=> a(10 - 3b) - \(\frac{1}{3}\)(10 - 3b) + \(\frac{10}{3}\)=0 

=> 3a(10 - 3b) - (10 - 3b) + 10 = 0

=> (3a - 1)(10 - 3b) + 10 = 0

=> (3a - 1)(3b - 10) = 10 = 1.10 = 2.5 = 5.2 = 10.1

+) Nếu 3a - 1 = 1 thì a = 2/3(Loại vì a là chữ số)

+) Nếu 3a - 1 = 2 thì a = 1 và 3b - 10  = 5 => b = 5 (Chọn)

+) Nếu 3a - 1 = 5 thì a = 2 và  3b - 10 = 2 => b = 4 (Chọn)

+) Nếu 3a - 1 = 10 thì a = 11/3 (loại)

Vậy các số  thỏa mãn yêu cầu là 15; 24

8 tháng 12 2016

11,22,44,88;33,66

8 tháng 12 2016

sao lại thế bạn.??

25 tháng 11 2015

Goi nhung so can tim la ab .

 Ta có: ab=axbx2, b (chẵn)

=>ax10+b=axbx2

=>b=axbx2‐ax10

=>b=ax﴾bx2‐10﴿

Đê bx2‐10 thì b phải là 6 hoặc 8

Nếu b=8, ta có:8= ax﴾8x2‐10﴿; 8=ax6. Vậy không có kết quả nào phù hợp với lý giải trên

Nếu b=6, ta có:6= ax﴾6x2‐10﴿; 6=ax2. Vậy a=3, suy ra ab=36

12 tháng 12 2017

36

hihi

12 tháng 4 2016

Có 1 số đó là số 36   

12 tháng 4 2016

k mình đi mình sẽ trả lời cho bạn

27 tháng 8 2018

bạn học lớp 6b k

27 tháng 8 2018

T bắt quả tang con quỳnh lên mạng hỏi bài nhé

27 tháng 8 2018

Làm thế nào vậy ???

1 tháng 10 2018

hihiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii  cấm đọc tiếp

địt lồn mẹ mày bú buồi đầu buồi liếm lông chim

8 tháng 8 2015

Ghi có dấu bạn nhé       

10 tháng 12 2016

36 bạn nhé