1) 5/7*(-1,4)= 5/7*(-7/5)= -1
2) 5 1/5+(-1)= 5 1/5-1= 4 1/5
3)5,25:4 1/5= 5 1/4 : 4 1/5= 21/4:21/5= 21/4*5/21= 5/4= 1 1/4
4) 1 1/4 -3 19/20= 5/4-79/20= 25/20-79/20= -54/20= -27/10= -2 7/10
1) 2 3/7-3,4= 2 3/7-3 2/5= 17/7-17/5= 85/35-119/35= -34/35
2)2 3/7+3,4= 2 3/7+3 2/5= 17/7+17/5= 85/35+119/35= 204/35= 5 29/35
3) -34/35:204/35= -34/35*35/204= -17/102
4)4,2+1 10/11= 21/5+21/11= 231/55+105/55= 336/55= 6 6/55
5)4,2-1 10/11= 21/5-21/11= 231/55-105/55= 126/55= 2 16/55
6)336/55:126/55= 336/55*55/126= 8/3= 2 2/3
7) -17/102:8/3= -17/102*3/8= -17/272= -1/16