Раскройте скобки и подобные 1) -6(1-ху)-2(3+2х)+12 2) 3y(2x--1)-5x(y+3)+6(x+y+1) 3) 2a(3-b)-3b(f-1)-5(ab-a-b) 4) -4(x-y-2)+6(1-x+y)+2(5x-5y-2) 5) 5(1-a+b)-3(2-a-b)+(1-a+2b)

1) -6(1-ху)-2(3+2х)+12 = -6+6xy-6-4x+12 = 6xy-4x.
2) 3y(2x-1)-(xy-1)-5x(y+3)+6(x+y+1) = 6xy-3y-xy+1-5xy-15x+6x+6y+6 =      
3y-9x+7.
3) 2a(3-b)-3b(f-1)-5(ab-a-b) = 6a-2ab-3bf+3b-5ab+5a+5b = 11a-7ab-3bf+8b.
4) -4(x-y-2)+6(1-x+y)+2(5x-5y-2) = -4x+4y+8+6-6x+6y+10x-10y-4 = 10.
5) 5(1-a+b)-3(2-a-b)+(1-a+2b) = 5-5a+5b-6+3a+3b+1-a+2b = 10b-3a.