Dane wyrażenie doprowadź do prostszej postaci i obicz wartość liczbową dla a=-3 b=-1 a kwadrat-b kwadrat __________________________________== 3a kwadrat -6ab kwadrat +3b kwadrat

a kwadrat-b kwadrat ____________________ 3(a - b)kwadrat (9-1):3(-3+1)kwadrat = 8:6 = 1i1/3

[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