a) BCNN(40;52)=520
b)BCNN(42;70;180)=1280
c)BCNN(9;10;11)=990
a) 40 = 23 x 5
52 = 22 x 13
bcnn ( 420 , 52 ) = 23 x5 x 13 = 520
b) 42 = 2x 3 x 7
70 = 2 x 5 x 7
180 = 22 x 32 x 5
bcnn ( 42 , 70 , 180 )
c ) 9=32
10 = 2 x 5
11 = 11
bcnn ( 9 , 10 ,11 ) = 32 x 2 x 5 x 11 = 990
k nha
a 520 , b 42; 70;180, c990 k tui nha tui k cho ba rui do y tui la chon tui nha tui tinh rui ra y chang ba tui ko copy dau k na