решите примеры : (6/35-4/7)-(-1,8-4,3)-5,7;   (3,9-5,8)-(-1/45-7/9)+1,1;  (1/30-5/6)-(3,9-2,2)-5,3;   (3,7-2,4)-(7/15-2/3)+5,9= .  И с объяснениями . заранее спасибо
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