Odpowiedzi

2009-09-22T16:56:40+02:00
Najlepsza Odpowiedź!
2009-09-22T17:11:08+02:00
A) 5 × (xy) = 5xy
b) 3a/4 × (-2a/3) = -6a²/12 = -a²/2
c) -2x × (-3xy) = 6x²y
d) x- z/2 - x/3 = -z/2+2x/3 = -3z/6+4x/6 = 4x-3z/6
e) -4 * (-x/2) × (- 2x/4) = -4(-x²/4) = x²
f) x+½ + 2x-¼ = 3x+¼
g) -(x+1) + (2x + 4) = -x-1+2x+4 = x+3
h) 3(a² - 4) - (-a² + 2) = 3(a²-4+a²-2) = 3a²-12+3a²-6 = 6a²-18