Помогите зделать 985 срочно!!!

Question

Помогите зделать 985 срочно!!!

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Answer 1

N 985.

1) (5/21 + 2/15) + 2/21 = 5/21 + 2/15 + 2/21 = 7/21 + 2/15 = 35/105 + 14/105 = 49/105.

2) (2/35 + 3/28) + 1/28 = 2/35 + 3/28 + 1/28 = 2/35 + 4/28 = 8/140 + 20/140 = 28/140 = 1/5.