Odpowiedzi

2010-01-07T08:24:37+01:00
(x+1)(x-2)+(x+2)(x-1)=x²-2x+1x-2+x²-1x+2x-2=2x²-4
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2010-01-07T09:26:02+01:00
(x+1)(x-2)+(x+2)(x-1) =
x² - 2x + x - 2 + x² - x + 2x - 2 =
2x² - 4 = 2 (x² -2)