Срочно !!! 7 класс !!
1.
a)
b)
2.
(6x-5xy)-(4x+xy)=(x(6-5y))-x(4+y)=x(6-5y)-x(4+y)=x(6-5y-(4+y))=x(6-5y-4-y)=x(2-6y)=x*2(1-3y)=2x(1-3y) 3ac³(5c²-a)=3ac³*5c²-3ac³a=15ac^5 -3a²c³