Odpowiedzi

2009-10-20T15:53:26+02:00
A) 5 * (xy)= 5xy
b) 3a/4 * (- 2a/3)=-6a²/12=-a²/2

c) - 2x * (- 3xy)= 6x²y
d) x - x/2 - x/3 = (6x-3x-2x)/6=x/6
e) - 4 * (- x/2) * (- 2x/4)
= -4*(2x²/8)= -2x²/2=-x²

f) x+1/2 + 2x-1/4 =
(2(x+1)+(2x-1))/4=
(2x+2+2x-1)/4=
( 4x+1)/4 = x+¼
g) - (x+1) + (2x + 4) = -x-1+2x+4= x+3
h) 3 (a do kwadratu - 4) - (a do kwadratu + 2) =
3(a²-4)-(a²+2)=
3a²-12-a²-2=
2a²-14
19 4 19