а)1 2/3- b=5/6 c+1 1/3=3 1/3+x=1 1/6 0,8-b=7/15 x : 0,2=1 1/3 a :2/3=3/4 б) 1 1/4 - b = 1/2 b * 5/7=1 7/12 +a=1 1/6 y-5/6=1/3 1 1/2 *a =6 7/8+ a= 1 1/4 c) y* 2/7=3/14 1 5/6 -y=2/3 c-0,6= 1/3 y*3/5 = 1/15 6/7:с= 3/14 х-7/10=7/10 b) 1 3/4 :x = 7 1 2/3 :y =5