а) (-16/17)+(-14/17)-(+15/17)-6/17
б) -(-10/13)+3/13-(+5/13)+(-8/13)
в) -(+5/7)+(-6/7)-(-1/7)+(+3/7)
г) -(-16/19)-2/19+(-5/19)+10/19

Даю 15 баллов.
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