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31 tháng 1 2022

UKM

^6^7g^7*(KHV C GTGFCCGttedx

8 tháng 12 2015

a) goi hai so la a ; b va a >b

vi UCLN(a,b)=18=>a=18k            ;       b=18q       (trong do UCLN (k,q)=1 va k>q)

=>a+b=162

18k+18q =162

18(k+q)=162

k+q=9

ta co bang sau   

 

k1234
q8765
a18365472
b14412610890

vay ...........

   
    
    

 

29 tháng 10 2016

21453 

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542454550212.100000000000000000000000000000000000000000000000000000000000000000000000000000
  
  
6 tháng 1 2018

Ta có : ƯCLN ( a,b ) = 45 \(\Leftrightarrow\hept{\begin{cases}a=45a'\\b=45b'\\\left(a',b'\right)=1\end{cases}}\)

Theo đề bài : a + b = 270

nên 45a' + 45b' = 270

suy ra a' + b' = 270 : 45 = 6

Do a \(\ge\)b nên a' \(\ge\)b' .

Chọn hai số a' , b' có tổng bằng 6, nguyên tố cùng nhau, a' \(\ge\)b' ta được : a' = 5 ; b' = 1

Do đó : a = 45 . 5 = 225

b = 45 . 1 = 45

10 tháng 7 2015
Ta có: a=45m (m thuộc N) b=45n (n thuộc N) (n;m)=1 =>a+b=270 45(m+n)=270 m+n=6.Mà (m;n)=1 =>m+n=1+5 Vậy a=45;b=225 a=225;b=45
5 tháng 11 2017

bạn kia làm đúng rồi

k tui nha

thank

17 tháng 8 2016

ngu quá đi!!!

17 tháng 8 2016

a = 45 . m (m thuộc N), b = 45 . n (n thuộc N)

(m; n) = 1 => a + b = 270; 45 . (m + n) = 270 => m + n = 6

Mà (m; n) = 1 => m + n = 5 + 1

Vậy a = 225; b = 45.