Toán Lớp 6: BCNN ( 40; 24; 32 ) BCNN ( 60; 90 ) ƯCLN ( 120; 180 )

Question

Toán Lớp 6:  BCNN ( 40; 24; 32 ) BCNN ( 60; 90 ) ƯCLN ( 120; 180 )

thaolanphuobg · Answer

~~ Bạn tham khảo ~~   $  $   40 = 2^3 . 5   24 = 2^3 . 3   32 = 2^5   => BCNN (40 ; 24 ; 32) = 2^5 . 3 . 5 = 480   $  $   ______________________________   $  $   60 = 2^2 . 3 . 5    90 = 2 . 3^2 . 5   => BCNN (60 ; 90) = 2^2 . 3^2 . 5 = 180   $  $   ______________________________   $  $   120 = 2^3 . 3 . 5   180 = 2^2 . 3^2 . 5   => ƯCLN (120 ; 180) = 2^2 . 3 . 5 = 60   $  $   ______________________________

daithanh · Answer

$ text{Ta c&oacute;:}$   $ text{40 = 2&sup3; . 5}$   $ text{24 = 2&sup3; . 3}$   $ text{32 = $2^5$}$   $ text{&rarr; BCNN(40,24,32) = $2^5$ . 3 . 5 = 480}$   $ text{Ta c&oacute;:}$   $ text{60 = 2&sup2; . 3 . 5}$   $ text{90 = 2 . 3&sup2; . 5}$   $ text{&rarr; BCNN(60,90) = 2&sup2; . 3&sup2; . 5 = 180}$   $ text{Ta c&oacute;:}$   $ text{120 = 2&sup3; . 3 . 5}$   $ text{180 = 2&sup2; . 3&sup2; . 5}$   $ text{&rarr; ƯCLN(120,180) = 2&sup2; . 3 . 5 = 60}$