A={x ϵ" role="presentation" style="font-size: 16px; display: inline; word-spacing: 0px; font-family: Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif; position: relative;">ϵ N l0≤" role="presentation" style="font-size: 16px; display: inline; word-spacing: 0px; font-family: Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif; position: relative;">≤ x ≤" role="presentation" style="font-size: 16px; display: inline; word-spacing: 0px; font-family: Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif; position: relative;">≤≤ 100}
A={x ϵ" role="presentation" style="font-size: 13.696px; display: inline; line-height: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; font-family: Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif; position: relative;">ϵϵ N l 0≤" role="presentation" style="font-size: 13.696px; display: inline; line-height: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; font-family: Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif; position: relative;">≤≤ x ≤" role="presentation" style="font-size: 13.696px; display: inline; line-height: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; font-family: Arial, 'Liberation Sans', 'DejaVu Sans', sans-serif; position: relative;">≤≤ 100 và x chia hết cho 5}