помогите пожалуйста 9/20 + (5/6 + 3/5), 19/20 + 7/30 + 14/15, 5/6 + 3/10 + 7/15, 7/12 + 1/8 + 1/3, 18/35 + 7/15 + 5/6, 1/20 + 11/20 + 4/25 + 6/25

/ это дробная черта
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