Фигура 1 1) (2; -3), (2; -2), (4; - 2), (4; -1), (3; 1), (2; 1), (1; 2), (0; 0), (-3; 2), (4; 5), (0; 8), (2; 7), (6; 7), (8; 8), (10; 6), (10; 2), (7; 0), (6; 2), (6; -2), (5; - 3), (2; -3). 2) (4; -3), (4;5), (3; -9), (0; -8), (1; - 5), (1; -4), (0; - 4), (0; -9), (-3; -9), (-3; -3), (-7; -3), (-7; -7), (-8; - 7), (-8; -8), (- 11; -8), (- 10; -4), (- 11; -1), (- 14; -3), (-12; 1), (- 11;2), (-8;4),(4;5). 3) Глаза: (2; 4), (6; 4).

Фигура 2

1) (2; 7), (0; 5), (-2; 7), (0; 8), (2; 7), (- 4; -3), (4; 0), (11; - 2), (9; -2), (11; -3),

(9; -3), (5; -7), (- 4; - 3). 2) Клюв: (-4; 8), (- 2; 7), (- 4; 6).

3) Kрыло: (1-3), (4; - 2), (7; -3), (4; - 5), (1; - 3).

4) Глаз: (0; 7)

1)12a²b³+3a³b²+16b²-a²=3a²b²(4b+a) + (4²b² - a²)=3a²b²(4b+a)+(4b-a)(4b+a)=
   
= (4b+a)(3a²b² + 4b- a)

2) 49c² -14c+1 -21ac+3a =  (49c²-14c+1) -3a(7c - 1) = (7c - 1)²  - 3a(7c - 1) =

=(7c-1)(7c - 1 - 3a)

3)ax²+ay²+x^4+2x²y²+y^4 = a(x²+y²)+(x^4+2x²y²+y^4) = a(x²+y²) +(x²+y²)²=

   = (x²+y²) (a +x²+y²)

4)  27c³-d³+9c²+3cd+d² = [(3c)³-d³]+ (9c²+3cd+d²) =

=[(3c - d)(9c²+3cd+d²)] + (9c²+3cd+d²) = (9c²+3cd+d²) (3c-d+1)

5) b³-2b²-2b+1 =(b³ + 1) - 2b( b+1) = (b+1)(b² -b+1) - 2b(b+1) =

  = (b+1)(b² -b+1-2b) = (b+1)(b² -3b+1)

Х2-21+54=0 теперь находим дискрименант:  D=21^2-54*4=441-216=225/                                                    21-15теперь находим корни:  х1==3                                                     2                                            21+15                                   х2==18                                             2 теперь находим среднее арифметическое:                                   18+3                                                                                                    =10,5                                                                                                           2 ответ: среднее арифметическое 10,5.