Ответ:
-2/5 ; -3/9=-1/3 -6/13
-1; -1 -1
-1 -1 -1
-1/5+(-1/5)=(-1-1)/5=-2/5;
-3/7+(-4/7)=(-3-4)/7=-7/7=-1
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Ответ:
-2/5 ; -3/9=-1/3 -6/13
-1; -1 -1
-1 -1 -1
-1/5+(-1/5)=(-1-1)/5=-2/5;
-3/7+(-4/7)=(-3-4)/7=-7/7=-1