104 грибы!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!100%-правельный ответ!!!!!!!!!!!!!!!!!!!!!!!!!!!
1.
а) x²-2x-8
б) 8a²+10ab-3b²
в) y³-7y²+13y-15
2.
a) (x-y)(a+4)
б) (x-y)(3+a)
3.
y²-yb-ya+ab=y²-yb-ya+ab
4.
y(y+3)=0
y1=0
y2=-3
<span>(2y-3)(3y+1)+2(y-5)(y+5)-(1-2y)²=6у²+2у-9у-3+2у²-50-1-4у²+4у=4у²-3у-54</span>