14/11*11/15+17/10*11/15=*10(14/15)+187/150=140/150+187/150=327/150=109/50=2,18
125.348 ≈ 125.35
АП: |125.35-125.348|=0.002
ОП: (|125.35-125.348|/|125.35|) * 100% ≈ 0,0016%
(x^2 -y^2)/xy / (x^2+y^2-2xy/xy)
b)25x²-10xy+y²+15x-3y=(5x-y)²+3(5x-y)=(5x-y)*(5x-y+3)
c)a³-27+6a²-18a=(a-3)*(a²+3a+9)+6a*(a-3)=(a-3)*(a²+3a+9+6a)=(a-3)*(a²+9a+9)