Đáp án:
x∈{24;36;48}
Giải thích các bước giải:
Ta có: x chia hết cho 12 và 12 < x < 50
=> x∈{0;12;24;36;48;60;...}
mà 12<x<50
=> x∈{24;36;48}
Vậy x∈{24;36;48}
`x \vdots 12`
Và `12 < x < 50`
⇒ `x ∈ BC ( 12)`
`BC( 12) = { 0 ; 12 ; 24 ; 36 ; 48 ; 60 ; ....}`
Mà `12 < x < 50`
⇒ `x ∈ { 24 ; 36 ; 48}`
Vậy `x ∈ { 24 ; 36 ; 48}`
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