вычислите: 8 + 4 5/7; 8 - 4 5/7; 4 5/7 - 8; -4 5/7 - 8; -4 5/7 - 8; -8 + 4 5/7
8+4 5/7=12 5/7 8-4 5/7=3 2/7 4 5/7-8=-3 2/7 -4 5/7-8=-12 5/7 -8+4 5/7=-3 2/7