х(у+z)-2y-2z= ху+хz -2y-2z= ху+хz-2(y+z)= х(у+z)-2(у+z)= (х-2)(у+z)
a(b+c)-b-c= ab+ac-b-c= ab+ac-(b+c)= ab+ac-a(b+c)= a(b-c)
a(b-c)-4b+4c= ab-ac-4b+4c= ab-4b-ac+4c= b(a-4)-c(a-4)= (a-4)(b-c)
a(a-b)-ac+bc= a^2-ab-ac+bc= a^2-(ab+ac)+bc= a^2-a(b+c)+bc= a^2-a(b+c)+bc= a(a-b)-a(c-b)
x(y-z)-y+z= xy-xz-y+z= xy-y+x(-z+1)= y(x-1)+x(1-z)= (x-1)(y-z)
2b(x-y)+y-x= 2bx-2by+y-x= 2bx+y-2by-x= b(2x+y)-1(2y+x)= (2x+y)(b-1)
5(c-b)+ab-ac= 5c-5b+ab-ac= 5(c-b)+a(b-c)= 5(c-b)+a(b-c)= 5(c-b)-a(c-b)= (5-a)(c-b)
2(x-c)-bx+bc= 2x-2c-bx+bc= 2x-bx-2c+bc= -b(x-2)+c(2-x)= (2-x)(c-b)
х(у+z)-2y-2z= ху+хz -2y-2z= ху+хz-2(y+z)= х(у+z)-2(у+z)= (х-2)(у+z)
a(b+c)-b-c= ab+ac-b-c= ab+ac-(b+c)= ab+ac-a(b+c)= a(b-c)
a(b-c)-4b+4c= ab-ac-4b+4c= ab-4b-ac+4c= b(a-4)-c(a-4)= (a-4)(b-c)
a(a-b)-ac+bc= a^2-ab-ac+bc= a^2-(ab+ac)+bc= a^2-a(b+c)+bc= a^2-a(b+c)+bc= a(a-b)-a(c-b)
x(y-z)-y+z= xy-xz-y+z= xy-y+x(-z+1)= y(x-1)+x(1-z)= (x-1)(y-z)
2b(x-y)+y-x= 2bx-2by+y-x= 2bx+y-2by-x= b(2x+y)-1(2y+x)= (2x+y)(b-1)
5(c-b)+ab-ac= 5c-5b+ab-ac= 5(c-b)+a(b-c)= 5(c-b)+a(b-c)= 5(c-b)-a(c-b)= (5-a)(c-b)
2(x-c)-bx+bc= 2x-2c-bx+bc= 2x-bx-2c+bc= -b(x-2)+c(2-x)= (2-x)(c-b)