1) 91;-8/13;-5,8;3,2;-4целых1/7

2)-40;2,2;-9/16;220;5целых4/15

1) -с

с=-91 => -(-91)=91

с=8/13с => -8/13

с=5,8 => -5,8

c=-3,2 => -(-3,2)=3,2

c= 4 1/7 => -4 1/7

2) -c

c=40 => -40

c=-2,2 => 2,2

c=9/16 => -9/16

c=-220 =>220

c=-5 4/15 => 5 4/15