1)а)2х-3ху+7-3х+5ху

-1х+2ху

1)б)6а^5-12а³

1)в)6у²-2ус+3ус-с²

6у²+1ус-с²

1)г)х³-3х²-4х+1х²-3х-4

х³-2х²-7х-4

1)д)4а+1

2)х²-5х-4х+20-2х²+12х

-1х²+3х+20

3)-2у+1у³(у²+3)

-2у³-6у+1у^5+3у³

1у³-6у+1у^5