对于不支持浮点型的10log10运算实现
kf10log(1+1/k)log(f)biggest margin1110log(2)03.0121.02410log(3/2)0.011.7735.904910log(4/3)0.772.0241.04857610log(5/4)0.020.9959.76562510log(6/5)0.991.7866.046617610log(7/6)0.781.4572.8247524910log(8/7)0.451.0381.07374182410log(9/8)0.030.5493.48678440110log(10/9)0.541因此误差最大值为3 当最高位k=1，m接近于1*10^p次方时达到
