1)3х² - 12 = 3(х² - 4) = 3(х² - 2²) = 3(х-2)(х+2)ах²+4ах + 4а = а(х² + 4х + 4) = а(х² + 2*х*2 +2²) = а(х+2)² = а(х+2)(х+2)-3а³+3аb² = - 3a(a² - b²) = -3a(a-b)(a+b)-3x² + 12x - 12 = - 3(x² - 4x + 4)= -3(x² - 2*x *2 + 2²) = - 3(x-2)²= -3(x-2)(x-2)2)¹/₂ a² - ab + ¹/₂ b² = 0.5a² - ab + 0.5b² =0.5(a² - 2ab+b²)=0.5(a-b)²==0.5(a-b)(a-b)x²(x-3) - 2x(x-3)+(x-3) = (x-3)(x² - 2x + 1) =(x-3)(x-1)²= (x-3)(x-1)(x-1)