1)(4а²б-3аб²)+(-а²б+2аб²)=4а²б-3аб²-а²б+2аб²=3а²б-аб²=аб*(3а-б)
2)(у²-3у)+(3у-2у²)-(4-2у²)=у²-3у+3у-2у²-4+2у²=у²-4=(у-2)*(у+2)
3)2х²-х*(2х-5у)-у*(2х-у)=2х²-2х²+5ух-2ух+у²=у²+3ух=у*(у+3х)
4)7м*(3м+2н)-3м(7н-2м)=21м²+14мн-21мн+6м²=21м²-7мн+6м²
5)(5p-4q)*(2p-2q)=10p²-8pq-10pq+8q²=10p²-18pq+8q²=2*(5p²-9pq+4q²)
6)(a²-2ab)*(a²-5ab+3b²)=a^4-5a³b+3a²b²-2a³b+10a²b²-6ab³=a^4-7a³b+13a²b²-6ab²