A(b-c)+d(c-b) x(y-5)-y(5-y) 3a(2x-7)+5b(7-2x) (x-y)²-a(y-x) 3(a-2)²-(2-a) 2(3-b)+5(b-3)²

1)ab-ac+dc-dквадрат 2)xy-5x-5y+y квадрат 3)Хквадрат - 2ху + Уквадрат - ау + ах 4)3(Аквадрат-4а+4)-2+а= 3Аквадрат-12а+12-2+а=3Аквадрат-11а+10 5)6-2b+5(bквадрат-6b+9)=6-2b+5Bквадрат-30b+45=%Вквадрат-32b+46 

a(b-c)+d(c-b)=a(b-c)-d(b-c)=(a-d)(b-c) x(y-5)-y(5-y)=x(y-5)+y(y-5)=(x+y)(y-5) 3a(2x-7)+5b(7-2x)=3a(2x-7)-5b(2x-7)=(3a-5b)(2x-7) (x-y)²-a(y-x)=(x-y)²+a(x-y)=(x-y)(x-y+a) 3(a-2)²-(2-a)=3(a-2)²+(a-2)=(a-2)(3+a-2)=(a-2)(1+a) 2(3-b)+5(b-3)²=2(3-b)-5(3-b)²=(3-b)(2-5(3-b))=(3-b)(2-15+5b)=(3-b)(5b-13)