1) 4x^2 y^2-9a^4 = (2ху-3а²)(2ху+3а²<span>)
2) x^2(1-x)+x(x-1)^2 = </span>x^2(1-x)+x(1-x)^2 = х(1-x)(х+(1-x)) = х(1-x)(х+1-х) =
= х(1-x)<span>
3) 25a^2-(a+3)^2 = (5а-(а+3))(</span>5а+(а+3)) = (5а-а-3)(5а+а+3) = (4а-3)(6а+3)
22+3=25(ч) - и говядины и свинины в фарше отношение
25ч - 100%
22ч - x%
x=22*100/25=88%
<span>Ответ:88%</span>
Y ' = 3cos3x cos2x - 2sin2x sin3x