a) Ta có:
a = 40 = 2³.5
b= 75= 3.5²
c = 105= 3.5.7
UCLN(a, b, c) = 5
b) ⇒ BCNN (a, b, c) = 2³. 3. 5².7 = 4200
a) ta có:
a = 40 = 23 . 5
b = 75 = 3 . 52
c = 105 = 3 . 5 . 7
UCLN(a,b,c) = 5
b) => BCNN (a,b,c) = 23. 3 . 52. 7 = 4200
`a)`
`40 = 2^3 . 5`
`75 = 5^2 . 3`
`105 = 3 . 5 . 7`
`=>ƯCLN (40,75,105) = 5`
`ƯC ( 40,75,105) = { 1,5}`
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`b)`
`40 = 2^3 . 5`
`75 = 5^2 . 3`
`105 = 3 . 5 . 7`
`BCNNN ( 40,75,105) = 2^3 . 5^2 . 3 .7 = 4200`
`BC(40,75,105) = { 0,4200,8400,....}`
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`#BaoL i n h`