Calculation: 1-2 / 5 + 3 / 5 =? 8.1 + 1 / 4 =? (1 / 4 + 1 / 3) × 24 =? 24 ／ 3 / 4 =? 0.2-1 / 5 =? 1 ／ 3 / 2 × 2 / 3

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