\(BCNN\left(12;25;30\right)=300\)
\(\Rightarrow x=300\) ( t/m điều kiện )
`=> x in BC(12, 25, 30)`.
Ta có: `12 = 2^2 xx 3`.
`25 = 5^2`.
`30 = 5 xx 2 xx 3`.
`=> x in B(300)`.
`=> x in {0, 300, 600, ...}` mà `0 <= x <= 500`
`=> x = 0, 300`.
`=>` Ta có:
`BCNNN (12; 25; 30) = 300`
`=>` `x = 300` vì:
`0 <= x <= 500`
\(BCNN\left(12;25;30\right)=300\)
mà 0 ≤≤ x ≤≤ 500
=> x= 300