1) -3a^2-6ab-3b^2 = -3(a^2+2ab+b^2) = -3(a+b)^22)a) x^2-xy-4x+4y = x(x-y)-4(x-y) = (x-4)(x-y)б) ab-ac-bc+cx+c-b = a(b-c)+c(x-1)-b(x-1) = (a+c)(b-x+1)3)а) (a-3)^2 = a^2-6a+9б) (2x+y)^2 = 4x^2+4xy+y^2в) (5b-4x)*(5b+4x) = 25b^2-20bx+20bx-16x^2 = 25b^2-16x^2
1) -3a^2-6ab-3b^2 = -3(a^2+2ab+b^2) = -3(a+b)^2
2)
a) x^2-xy-4x+4y = x(x-y)-4(x-y) = (x-4)(x-y)
б) ab-ac-bc+cx+c-b = a(b-c)+c(x-1)-b(x-1) = (a+c)(b-x+1)
3)
а) (a-3)^2 = a^2-6a+9
б) (2x+y)^2 = 4x^2+4xy+y^2
в) (5b-4x)*(5b+4x) = 25b^2-20bx+20bx-16x^2 = 25b^2-16x^2