Toán Lớp 6: M = { x thuộc Z / -20 < x < hoặc bằng 20

M = { x ∈ Z / -20 < x $ le$ 20 } => M ∈ { -19 ; -18; -17; ... ; 17; 18; 19; 20 }

- Vì: M = { x ∈ Z / -20 < x <= 20 } => M = { -19; -18; -17; ... ; 19; 20 } @Rin

Toán Lớp 6: M = { x thuộc Z / -20 < x

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