The simple calculation is (53.76-17.6) △ 1.8 (0.8 × 7 + 4.56 △ 1.9) × 12.5 15.73-（2.17+0.73）-1.83

8 = 10 * (7 + 3) = 10015.73 - (2.17 + 0.73) - 1.83 = 15.73-0.73 - (2.17 + 1.83) = 15-4 = 11

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