He had accomplished little if anything at all.if是什么用法?

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• He had accomplished little if anything at all.if是什么用法?
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• If any at
• 已知a>0且a≠1,函数f(X)=loga(X+1)在区间（-1,+∞）上递减,求证：对任意实数x1>0,X2>0,恒有1/2[f(x1-1)+f(x2-1)]>=f[(x1+x2-2）/2]