1.
a) 39x³y = 3*13x³y = 3x
26x²y² 2*13x²y² 2y
б) 3y = 3y = 3
y²-2y y(y-2) y-2
в) 3a-3b = 3(a-b) = 3
a²-b² (a-b)(a+b) a+b
г) a² -25 = (a-5)(a+5) = a+5
a² -10a+25 (a-5)² a-5
4.
3a² +6 - 3 - 1 =
a³ +1 a² -a+1 a+1
= 3a²+6 - 3 - 1 =
(a+1)(a²-a+1) a²-a+1 a+1
= 3a²+6-3(a+1)-(a²-a+1) =
(a+1)(a²-a+1)
=3a²+6-3a-3-a²+a-1=
(a+1)(a²-a+1)
= 2a²-2a+2 = 2(a²-a+1) = 2
(a+1)(a²-a+1) (a+1)(a²-a+1) a+1
2 = 2 = -5
-1.4+1 -0.4