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2010-03-17T18:47:44+01:00
A kwadrat-b kwadrat
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3(a - b)kwadrat

(9-1):3(-3+1)kwadrat = 8:6 = 1i1/3
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2010-03-17T18:49:35+01:00
[a² - b²]/ [ 3a² - 6ab +3b²] = [(a-b)(a +b)]/[3*(a² -2ab +b²)] =
= [(a-b)(a+b)]/ [3*(a-b)(a-b)] = (a+b)/[3*(a-b)]

a = -3 , b = -1
(-3 -1)/[3*(-3 +1)] = -4/[3*(-2)] = -4 /(-6) = 4/6 = 2/3
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