斜率係一種比值,用嚟表示傾斜嘅程度。計法係高除以底。
一條直線嘅斜率喺任何一點都係一樣。
計曲線斜率要用微分。
對一個函數,如果要搵兩點譬如 同 嘅斜率:
如果要搵曲線中某點 時嘅斜率,用上面條式會變咗(不定式),所以要用極限嚟計:
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