(b+3)(b-3)=(2c-1)(2c+1)=(3-1/5a)(3+1/5a)=(2-x)(2+x)=(7p+3)(7p-3)=(k-y)(k+y)=(x+3y)(x-3y)

(b+3)(b-3)=
(2c-1)(2c+1)=
(3-1/5a)(3+1/5a)=
(2-x)(2+x)=
(7p+3)(7p-3)=
(k-y)(k+y)=
(x+3y)(x-3y)=
(10a-b)(b+10a)=
(2a-b)(2a+b)=
(y+4)(y-4)=
(8x+4a)(8a-4a)=
9p-4=
1-25x=
ПОЛНЫЙ ОТВЕТ. 20 БАЛЛОВ.