Ответы на вопрос:
4-(41/84 -5/21) + 7 11/30 = 4 -(41/84 - 20/84) +221/30 = 4 - 21/84 + 221/30 = 4 - 1/4 +221/30 = 4 -15/60 +442/60 =4 - 427/60 = -187/60 = - 3 7/60
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