1) (x^2 - 4)(x^2 - 6) = 0 раскрыть скобки х^4 -10х^2 +24 = 0
(x^2 ^- 5)(x^2 - 16) = 0 аналогично х^4 - 21х^2 + 80 = 0
<span>53
(a+b)³ - a²(a+b)²/a +b²(a-b)²/b=(a+b)³-a(a²+2ab+b²)+b(a²-2ab+b²)=
=a³+3a²b+3ab²+b³-a³-2a²b-ab²+a²b-2ab²+b³=2a²b+2b³=2b(a²+b²)
2b(a²+b²)≠4ab²
54
(y³+12y²+48y+64-9y²-48y-64)/y²=-1
(y³+3y²)/y²=-1
y²(y+3)/y²=-1
y+3=-1
y=-1-3
y=-4</span>