2/ A 60 2 .3.5 A 3 2 B72 2 .3 B/ƯCLN(A,B) = ƯCLN(60,7...
Bài 3:
2
/ a
60
2 .3.5
a
3
2
b
72
2 .3
b/ƯCLN(a,b) = ƯCLN(60,72)=2 .3
2
= 12 0,5đ c/ BCNN(a,b) = BCNN(60,72)=2 .3 .5
3
2
=8.9.5=360 d/ƯCLN(a,b). BCNN(a,b) = ƯCLN(60,72). BCNN(60,72)=12.360= 4320 và 60.72 = 4320 Vậy: ƯCLN(60,72). BCNN(60,72)= 60.72 Hay ƯCLN(a,b).BCNN(a,b) = a.b