Question

lg（x）和lg（x+1）的图像怎么画?求图解

Answer 1

选一些点,如：

x = 0.1, lgx = -1

x = 0.5, lgx = -0.30

...

x = 1, lgx =0,

x = 2, lgx = 0.30

x = 3, lgx = 0.48

x = 4, lgx = 0.60

x = 10, lgx = 1

然后画,见图,紫线

y = lg(x+1)是y = lgx向左平移一个单位得到的（绿线）