(a²-2ab-1)+(a²-4ab+5)=? po zredukowaniu działania zamień a=¼ b=2 prosze na dziś 23.03.2010 daje naj

(a²-2ab-1)+(a²-4ab+5)=? a²-2ab-1+a²-4ab+5=? 2a²-6ab+4 = ? a=¼ b=2 2a²-6ab+4 = ? 2*(¼)² -6*¼*2 +4 = 2*1/16 -6*½ +4= ⅛ -3 +4= ⅛ +1 = 1⅛

(a²-2ab-1)+(a²-4ab+5) = = a² - 2ab - 1 + a² - 4ab + 5 = = -6ab + 4 = = -6(¼ * 2) + 4 = = -6 * ½ + 4 = = 3 + 4 = = 7 ;))