已知函数f(x)的定义域为D,若对任意x1,x2∈D,当x1<x2时,都有f(x1)≤f(x2),则称函数f(x)在D上为非减函数.设函数f(x)在[0,1]上为非减函数,且满足以下三个条件:①f(0)=0;②f(x3)=12f(x);③f(1-x)=2-f(x).则f(13)+f(18)=( )A.1B.32C.2D.52
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