Упростите выражение:

(2х+1)(х-1)=
(3-у²) (у-4) =
а²+(2-а) (а+5) =
(n-1) (n²+n-2) =

(2x + 1)(x - 1) = 2x² - 2x + x - 1 = 2x² - x - 1

(3 - y²)(y - 4) = 3y - 12 - y³ + 4y² = - y³ + 4y² + 3y - 12

a² + (2 - a)(a + 5) = a² + 2a + 10 - a² - 5a = - 3a + 10

(n - 1)(n² + n - 2) = n³ + n² - 2n - n² - n + 2 = n³ - 3n + 2

1)2х²-2х+х-1=2х²-х-12)=3у-12-у³+4у²=-у³+4у²+3у-123)а²+2а+10-а²-5а=10-3а4)(n-1)(n²+n-2)=n³+n²-2n-n²-n+2=n³-3n+2