11. 已知x∈Rx\in Rx∈R,m=(x+1)(x2+x2+1)m=(x+1)(x^{2}+\frac{x}{2}+1)m=(x+1)(x2+2x+1),n=(x+12)(x2+x+1)n=(x+\frac{1}{2})(x^{2}+x+1)n=(x+21)(x2+x+1),则mmm,nnn的大小关系为((( )))