(y-c+ 3)^2 +2(c-y- 3) (у+c+3) + (у+c+3)^2 =
(у-c+ 3)^2 — 2(у-c+ 3) (у+c+3) + (у+с+3)2=
(y-c-+3-y-c-3)^2 = (-2c)^2 = 4c^2
4с^2 =4*0,2^2=4*0,04 = 0,16
(y-c+ 3)^2 +2(c-y- 3) (у+c+3) + (у+c+3)^2 =
(у-c+ 3)^2 — 2(у-c+ 3) (у+c+3) + (у+с+3)2=
(y-c-+3-y-c-3)^2 = (-2c)^2 = 4c^2
4с^2 =4*0,2^2=4*0,04 = 0,16