By using a technique similar to the one introduced by Kong [J. Math. Anal. Appl. 229 (1999) 258-270] and employing an arithmetic-geometric mean inequality, we establish oscillation criteria for second-order forced dynamic equations on time scales containing mixed nonlinearities of the form (p(t)x~△)~△ + q(t)x~σ + ∑ (q_i(t)|x~σ|~(α_i-1)x~σ) = e(t) (i from 1 to n ), t≥t_0 where p,q, q_i,e : T → R are right-dense continuous with p > 0, σ is the forward jump operator, x~σ(t) := x(σ(t)), and the exponents satisfy α_1 > ···>α_m > 1 >α_(m+1) > ··· α_n > 0. The results extend many well-known interval oscillation criteria from continuous case to arbitrary time scales.
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