1) а) x^2+8x+16
б) a^2-4ab+4b^2
в) 9y^2-25
2) a) c^2+3c-2c-5-(c^2-2c+1)=c^2+c-5-c^2+2c-1=3c-6
б) 3(a^2+2ac+c^2)-6ac=3a^2+6ac+3c^2-6ac=3a^2-3c^2
3) a) (4a-3)(4a+3)
б) 3х(х^2-25)=3x(x-5)(x+5)
в) 2(х^2+2xy+y^2)=2(x+y)^2
4) 36x^2-12x^3+x^4-x^2(x^2-1)+18x+12x^3=36x^2+x^4-x^4+x^2+18x=37x^2+18x
5) a) (y-2-2y)(y-2+2y)=(-y-2)(3y-2)
б) (x-2y)(x^2+2xy+4y^2)
в) (4-(x^2)/9)(4+(x^2)/9)
г) (2x+2y)+(x^2-y^2)=2(x+y)+(x-y)(x+y)=(2+x-y)(x+y)