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Answers for “为什么从正到负的变化意味着连续函数有一个零点?”

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The points where a function's graph crosses the x-axis (where y=0y = 0) can be referred to as zeros, x-intercepts, roots, or solutions.

Conditions: The function is being viewed as a graph in the coordinate plane.; The context is solving f(x)=0f(x) = 0.

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The Intermediate Value Theorem states that for a continuous graph, moving from one point to another forces the graph to pass through every y-value lying between the two endpoint y-values. Visually, this means a continuous curve cannot skip intermediate output levels.

Conditions: The graph must be continuous.; The two compared points lie on the same continuous branch of the graph.; The target y-value lies between the y-coordinates of those two points.