Вычислите.

а. (3/4 - 1/3) : 5/7 : (1/4 + 2/3) × 6/11

б. 3/20 × (7/12 - 1/2) + 79/80 : 13/24 : (7/12 + 1/2) - 1/4

в. (3 + 7/11) × 1/4 - 1/22 : (5 - 3/11) : 13 + 1/2.

Решите, пожалуйста, с вычислением, а не просто ответ
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