X \(⋮\)12 = B(12)
B(12) = { 12 ; 24 ; 36 ; 48 ; 60 ; ... }
12 \(\le\)X\(\le\)50 => X = { 12 ; 24 ; 36 ; 48 }
Hok tốt
\(x\in\left\{12;24;36;48\right\}\)
Trả lời :
Vì \(x⋮12\)và \(12\le x< 50\)
\(\Rightarrow x\in B\left(12\right)\)
\(B\left(12\right)=\left\{0;12;24;36;48;60;...\right\}\)
Vậy \(x\in\left\{12;24;36;48\right\}\)
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