Zad 4
1. P=a*b P=(a+4b)(2a+1)=2a^2+a+8ab+4b
2.P=a*h/2 P=3a(a+2b)/2= (3a^2 +6ab)/2=(3a^2)/2+3ab
3.P=a*h P=(2a-b)(3-a)=6a-2a^2-3b+ab
4.P=(a+b)*h/2 P=(a+a+b)(a+2)/2= (2a+b)(a+2)/2= 2a^2 +4a+ba+2b/2=a^2 +2a+ba/2+b
Zad 5
Pole A = xy
Pole B = (x - 3)(y - 3) = xy - 3y - 3x + 9
Różnica pól = Pole A - Pole B = xy - (xy - 3y - 3x + 9) =
= xy - xy + 3y + 3x - 9 = 3x + 3y + 9
