A) =(ab+ac)-(4b+4c)=a(b+c)-4(b+c)=(b+c)(a-4)
б) =(3a-3m)-(ay-my)=3(a-m)-y(a-m)=(a-m)(3-y)
в) =(5c+5c²)-(a+ac)=5c(1+c)-a(1+c)=(1+c)(5-a)
a) x²+6x+8=x²+2x+4x+8=(x²+2x)+(4x+8)=x(x+2)+4(x+2)=(x+2)(x+4)
б) x²-8x+15=x²-3x-5x+15=(x²-3x)-(5x-15)=x(x-3)-5(x-3)=(x-3)(x-5)