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б) (3х + 1) – (– 3х2 – 3х + 1) = 3x + 1 + 3x2 + 3x - 1 = 3x2 + 6x (= x (3x+6))
в) (4m4 + 4m2 – 13) + (4m4 – 4m2 + 13) = m4 + 4m2 – 13 + 4m4 – 4m2 + 13 = 5m4
г) (2p2 + 3pq + 8q2) – (6p2 – pq + 8q2) = 2p2 + 3pq + 8q2 - 6p2 + pq - 8q2 = 4pq - 4p2 - 8q2
д) (15m7 – 3m4 + m3 + 5) + (– 15m7 + 3m4 – m3 – 5) = 15m7 – 3m4 + m3 + 5 – 15m7 + 3m4 – m3 – 5 = 0
е) (8a3 + 3a2b + 5ab2 + b3) – (18a3 – 3a2b – 5ab2 + 2b3) = 8a3 + 3a2b + 5ab2 + b3 - 18a3 + 3a2b + 5ab2 - 2b3 = -10a3 + 6a2b + 10ab2 - b3

а) (7х2 – 5х + 3) + (7х2 – 5) =14х^2-5x-2
б) (3х + 1) – (– 3х2 – 3х + 1) = 3х+1+3х^2+3x-1=3х^2+6x
в) (4m4 + 4m2 – 13) + (4m4 – 4m2 + 13)=4m^4 + 4m^2 – 13+4m^4 – 4m^2 + 13=8m^4
г) (2p2 + 3pq + 8q2) – (6p2 – pq + 8q2) =-4p^2+4pq
д) (15m7 – 3m4 + m3 + 5) + (– 15m7 + 3m4 – m3 – 5)=0
е) (8a3 + 3a2b + 5ab2 + b3) – (18a3 – 3a2b – 5ab2 + 2b3)=-10a^3+6a^2b+10ab^2-b^3