198*3=594
594*3=1782
1782*3=5346
5346-7*477=2007
X+a)/(x+b=y-b)/(y-a
x+a*y-a=y-b*x+b
xy-ax+ay-a^2=xy-bx+yb-b^2
-a(x-y)+b(x-y)-(a-b)(a+b)=0
(a-b)(x-y)+(a-b)(a+b)=0
x-y+a+b=0
x+y+a+b=2y
Г)9/18 и 2/18
з)9/18 и 14/18
м)33/110 и 100/110
р)117/130 и 120/130