Răspuns :
Sper sa intelegi ce am scris , daca nu , ma poti intreba , sunt aici sa ajut !
sa traducem:
A={144,215,300,121,444}
A₁={x ∈ A | 3 | x} => A₁={144,300,444}
A₂={x ∈ A | 5 | x} => A₂={215,300}
A₃={x ∈ A | 9 | x} => A₃={144}
A={144,215,300,121,444}
A₁={x ∈ A | 3 | x} => A₁={144,300,444}
A₂={x ∈ A | 5 | x} => A₂={215,300}
A₃={x ∈ A | 9 | x} => A₃={144}