A. 160 = 25 . 5
48 = 24 . 3
90 = 2 . 32 . 5
ƯCLN(160; 48; 90) = 2
BCNN(160; 48; 90) = 25.32.5 = 1440
B. 520 = 23 . 5 . 13
200 = 23 . 52
120 = 23 . 3 . 5
ƯCLN(520; 200; 120) = 23.5 = 40
BCNN(520; 200; 120) = 23.3.52.13 = 7800
C. 14 = 2 . 7
98 = 2 . 72
280 = 23 . 5 . 7
ƯCLN(14; 98; 280) = 2.7 = 14
BCNN(14; 98; 280) = 23.5.72 = 1960
a,160=25.5
48=24.3
90=2.32.5
ƯCLN(160,48,90)=2
BCNN(160,48,90)=25.32.5=1440
b,520=23.5.13
200=23.52
120=23.3.5
ƯCLN(520,200,120)=23.5=40
BCNN(520,200,100)=23.3.52.13=7800
c,14=2.7
98=2.72
280=23.5.7
ƯCLN(14,98,280)=2.7=14
BCNN(14,98,280)=23.5.72=1960