1 and lg are logarithms based on 10 (commonly used logarithms), such as lg 10= 1.

If 10 y = x, y is the common logarithm of x: y=lgx.

Function y = lgx(x & gt；; 0)

Range r

Zero x = 1

Monotonically increasing in (0, +∞)

Derivative d/dx (lgx) =1/(xln10)

Indefinite integral ∫ lgxdx = (xlnx-x)/(ln10)+c

When x