ta có :
a, 40=23*5
52=22*13
ƯCLN ( 40;52)=4
BCNN(40.52)=520
a) 40 = 23 . 5
52 = 22 . 13
=> ƯCLN(40, 52) = 22 = 4
=> BCNN(40, 52) = 23 . 5 . 13 = 520
ƯC(40, 52) = Ư(4) = { 1 ; 2 ; 4 }
BC(40, 52) = B(520) = { 0 ; 520 ; 1040 ; 1560 ; 2060 ; ... }
b) 40 = 23 . 5
72 = 23 . 32
196 = 22 . 72
=> ƯCLN(40, 72, 196) = 22 = 4
=> BCNN(40, 72, 196) = 23 . 32 . 5 . 72 = 17 640
ƯC(40, 72, 196) = Ư(4) = { 1 ; 2 ; 4 }
BC(40, 72, 196) = B(17 640) = { 0 ; 17 640 ; 35 820 ; ... }
a)Ta có :
40=23.5
52=22.13
=>ULCN(40,52)=22=4
BCNN(40,52)=23.5.13=520
UC = { 1,2,4}
BC={0,520,1040,1560,2600,.....}
b) Ta có
40 = 23.5
72=23.32
196=22.72
=>UCLN(40,72,196)=22=4
BCNN(40,72,196)=23.32.5.72=17640
UC={1,2,4}
BC{0,17640,35280,70560,.....}