0.001 = 1/1000
lg 0.001/lg2
= - lg1000/lg2
= - 3/ lg2
= -3 / 0.3010
= -9.9658
其中,如果你不知道lg2 是几,就要用计算器或查表.lg0.001变成lg1000lg2不扩大1000的话,公式的值对的吗?不是扩大。注意前面的负号。0.001 = 1/1000lg0.001 = lg1/1000 = 0 - lg1000 = -3大哥 lg1/1000 = 0 - lg1000 //怎么变成0 -lg1000 的lg(a/b) = lga - lgb对数的运算法则lg1 =0lg1/1000 = 0 - lg1000