数学长征，The slopes of tangent lines,Derivatives,For the derivative, the highlights and dots again represent positive, zero, and negative, but instead corresponding to the outputs of the function. We see that it’s a match,数学长征,数学游戏,数学故事,数学App,数学闯关,数学闯关游戏

第1686题：The slopes of tangent lines

Which one of the three graphs below represents the derivative of the function graphed above?

Tip:

A strategy for predicting what the derivative of a function will look like is to keep track of these moments on a number line.

The highlights above the number line represent when the slope is positive, the dots on the number line represent when the slope is zero, and the highlights below the number line represent when the slope is negative.

From brilliant.org