tim uoc

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dotran133

Ư ( 420 ) = 2^2 . 3 .5 .7
Ư ( 700 ) = 2^2 . 5^2 . 7
ƯCLN ( 420 ; 700 ) = 2^2 . 5 . 7 = 140
Vậy a = 140
 
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