<span>(2-х)(2+х)(х-1)+х²(х-1)
=(х-1)((2-х)(2+х)+х²))=(х-1)(4-х²+х²)=4(х-1)</span>
<span>(1/2-9/4)/(1/2-11/4)=(2/4-9/4)/(2/4-11/4)=(-7/4)/(-9/4)=(7/4)/(9/4)=7/4 * 4/9=7/9</span>
(y-6)(y+6)/3y(y-6)=y+6/3y
-4+6/-12=-2/-12=1/6
А) x^3 - 9x = x(x^2 - 9) = x(x-3)(x+3)
Б) -5a - 10 ac - 5c^2 = -5 (a + 2ac + c^2)
В) 16x^4 -81 = (4x^2 + 9)(2x-3)(2x+3)
Г) x^2 - x - y^2 - y = (x^2-x) - (y^2 + y) = x(x - 1) - y(-y-1)