Ответы и объяснения

2014-02-10T18:09:11+04:00
-5 1/4+7 3/8=-21/4+56/8=-42/8+56/8=14/8=1 7/8
9 1/6+(-5 3/4)=54/6+(-23/4)=108/12-68/12=39/12=3 3/12=3 1/4
4 3/7+(-8 9/14)=31/7-121/14=62/14-121/14=-59/14=-4 3/14