1. 0, 2(5х+3)
2. а (4+3а)
3. - 0,5х (4,2-7)
4. 5х (2-3х)+3(5х²-х)-7(х-1)
5. 2а²(3-2а+4а²)
6. - 3х²(0,3х-0,7)
7.3а(а²+3а-2)
8.0,4х(3-5х+10х²)
9. 4х²-6х+12
10. 5х³+15х²-25х