Zad. 1
a) a+b
b) y^2+5
Zad.2
a)5x(-2)xy^2=10x^2y^2
b)r^3a^3b^2
Zad.3
a)9x+13n
b)ab^2
c)2x
Zad.4
a) (4a-8)+(7a+5)=4a-8+7a+5=11a-3
b) 6x-(9x-2)=6x-9x+2= - 3x+2
C) (-7y+8)-(-10y+9)= - 7y+8+10y-9= 3y-1
Zad.5
3(a-4b)=3a-12b
5y(y+8)=5y^2+40y
st(8s^2-16t+12)=8s^3t-16st^2+12st
(18x-6):3=6x-2
Zad.6
(3c+5a)(4+2a)=12c+6ac+20a+10a^2
(x-2)(x-3)=x^2-3x-2x+6=x^2-5x+6
(a+5b-4)(3+2a)=3a+2a^2+15b+10ab-12-8a=2a^2+10ab+15b-5a-12
(a+10)(a-5)(a+20)=(a^2-5a+10a-50)(a+20)=(a^2+5a-50)(a+20)=a^3+20a^2+5a^2+100a-50a-1000=a^3+25a^2+50a-1000
Zad.7
30x-60=30(x-2)
6x^2y-12xy+2x=2x(3xy-6y++1)