Вариант 4
1. 10a + 15b
2. 2ab – 5b
3. x5 – x4
4. 2m6 + 8m3
5. 3xy2 + 6y
6. 5bc2 + bc
7. a2b2 – 4ab3 + 6a3b
8. b(3 – x) - 4(3 – x)
9. 5(a – b) + x(b – a)
10. 2x6y3 – 8y4x2
11. 8m3n3 – 12m5n3 + 20mn5
12. (5 – x)(2x - 3) + (x – 5)(x + 5)
13. a3(a + 4) – 3a2(4 + a)2