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In this paper,the oscillation criteria for the solutions of the nonlinear differential equations of neutral type of the forms:rn［x(t)+p(t)x(σ(t))］″+q(t)f(x(τ(t)))g(x′(t))=0rnandrn［x(t)+p(t)x(σ(t))］″+q(t)f(x(t),x(τ(t)))g(x′(t))=0rnare obtained.