Odpowiedzi

2010-02-15T15:56:14+01:00
A) 6(x -4) - 2 = 6x-24-2 = 6x-26
b) 2(x + 1) - 3(x - 1) = 2x+2-3x+3 = -x+5
c) -3(y - 2) + 4(y + 2) = -3y+6+4y+8 = y+14
d) 5(x - y - 1) - 4(x + 2) = 5x-5y-5-4x-8 = x-5y-13
e) 2(3a + b) - 2(a - b) = 6a+2b-2a+2b = 4a+4b
f) ½(4x - 4) - 2x = 2x-2-2x = -2
g) x(x - 1) - 3(x² - x) = x²-x-3x²+3x = -2x²+2x
h) 5a(a - 3) - 3a(a - 5) = 5a²-15a-3a²+15a = 2a²
i) 3x (x + ⅓ y) - 2y (½ x - ½) = 3x²+xy-xy+y = 3x²+y
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