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The existence of positive solutions of the nonlinear fourth order problem u(4)(x)=λα(x)f(u(x)),u(0)=u′(0)=u′(1)=u^m(1)=0 is studied,where a:[0,1]→R may change sign,f(0)>0,λ>0 is sufficiently small.Our approach is based on the Leray-Schauder fixed po