计算器算log2(1000+1) = 9.9672262588359935240381450182143近似计算log2(1000 + 1) = log2[1024 - 23] = log2[1024] + log2[1 - 23/1024]~= 10 - 23/1024*(1/ln2) = 10 - 23/[1024ln2]= 10 - 0.032404283144966951532498308264691= 9.9675957168550330484675016917353。