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26 tháng 12 2014

ƯCLN(a;b)=21    =>   a chia hết cho 21    => a=21k​ 

                                                                                         ƯCLN(k;q)=1

                                b chia het cho 21    => b=21q

a.b=2426

=> 21k.21q=2426  

=> 21.21.k.q=2426

=> 441.k.q=2426

=>        k.q=2426:441 (ko chia het, ban xem lai de bai di)

26 tháng 12 2014

ƯCLN(a;b)=21    => a chia hết cho 21    => a=21k

                                                                                        ƯCLN(k;q)=1

                             b chia het cho 21     => b=21q

a.b=4747  => 21k . 21q=4747

               => 21.21 .k.q=4747

               => 441.k.q   =4747

               =>        k.q  =4747:441 (ko chia het ban oi)

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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