Question

ДАЮ 25 БАЛЛОВ!!!! СРОЧНО!!!

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Answer 1

∆__2-В__∆

5/6 + (-7/12) = 5/6-7/12 = 1/4

-3/5•5/9 = -1/3

-3/10 - 1/15 = 11/30

8/21:(-4/7)=-2/-3