A)18a=-270
a= -270/18
a=-15
б) -x/16=-48
x=48*16
x=768
в) 140/y=-70
y=140/70
y=-2
(4 1/2 - 2 1/4) * 11/9 : 1/9 = 24 3/4,
1) 4 1/2 - 2 1/4 = 4 2/4 - 2 1/4 = 2 1/4,
2) 2 1/4 * 11/9 = 9/4 * 11/9 = 11/4 = 2 3/4,
3) 2 3/4 : 1/9 = 11/4 * 9/1 = 99/4 = 24 3/4