а) -1 3/7-(+2 3/7)=
 -1 3/7-(-2 3/7)=
 1 3/7-(-2 3/7)=
 1 3/7-(+2 3/7)=
 1 3/7+(-2 3/7)=
 -1 3/7+(-2 3/7)=
Просто ответы, а как решали, то есть по действием не пишите!
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