Zadanie 1
a)
(3x+5)+(7x-2y+6)+(-x+y-1)=3x+5+7x-2y+6-x+y-1=9x-y+10
b)
-[-(3x+2y)]-(-2x-2y)+(-5x-3y)=-(-3x-2y)+2x+2y-5x-3y)=3x+2y-3x-y=y
c)
6xy-(2xy+3y)+(-xy+4x-7y)=6xy-2xy-3y-xy+4x-7y=4x+3xy-10y
d)
(4a^2-3ab+b^2)-(-a^2-ab+b^2)-(4a^2-2b)=4a^2-3ab+b^2+a^2+ab-b^2-4a^2+2b=a^2-2ab+2b
e)
(2a+5ab+3b)-(3a+5ab+1)-(-a+3b)=2a+5ab+3b-3a-5ab-1+a-3b=-1
zadanie 2
a) -7x(a+2b)=-7ax-14bx
b) 4ab(a*7)=28a^2b
c) (2x+3y)*3a=6ax+9ay
d) 7x(-2x^+4xy+1)=-14x^2+28xy+7x