4) 1 действие
1. 2 1/7:1 1/4=12/7
2.5 1/4-12/7=99/28
3.5/7-99/28=-2 23/28
Координаты
А=5/8, В=1 1/4,С= -1 1/8, D= -1/2
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4) 1 действие
1. 2 1/7:1 1/4=12/7
2.5 1/4-12/7=99/28
3.5/7-99/28=-2 23/28
Координаты
А=5/8, В=1 1/4,С= -1 1/8, D= -1/2