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In this paper, by employing two fixed point theorems of a sum operators, we investigate the existence and uniqueness of positive solutions for the following fractional boundary value problems: - D-0+(alpha) x(t) = f (t, x(t), x(t)) + g(t, x(t)), 0 < t < 1, 1 < alpha < 2, where D-0+(alpha) is the standard Riemann-Liouville fractional derivative, subject to either the boundary conditions x(0) = x(1) = 0 or x(0) = 0, x(1) = beta x(eta) with eta, beta eta(alpha-1) is an element of(0, 1). We also construct an iterative scheme to approximate the solution. As applications of the main results, two examples are given.
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