Вычислите:
1) (-3/14 -8/21) : 20/21
2) 3/8 : (-5/8)-(-2 1/4):(-1 4/11)
3) (-4 1/12+ 3 9/10): 3 3/10
4) (11/14-5/6):(11/14-3/4)

Помогите! Дам 15 баллов!
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