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歡迎您訪問數(shù)學考題練習:如圖,圖象(折線OEFPMN)描述了某汽車在行!

數(shù)學考題練習:如圖,圖象(折線OEFPMN)描述了某汽車在行

更新時間:2024-01-12 14:05:32作者:貝語網(wǎng)校

如圖,圖象(折線OEFPMN)描述了某汽車在行駛過程中速度與時間的函數(shù)關(guān)系,下列說法中錯誤的是

A.第3分時汽車的速度是40千米/時

B.第12分時汽車的速度是0千米/時

C.從第3分到第6分,汽車行駛了120千米

D.從第9分到第12分,汽車的速度從60千米/時減少到0千米/時

試題答案

C

試題解析

根據(jù)圖象反映的速度與時間的關(guān)系,可以計算路程,針對每一個選項,逐一判斷.

解答:橫軸表示時間,縱軸表示速度.

當?shù)?分的時候,對應的速度是40千米/時,A對;

第12分的時候,對應的速度是0千米/時,B對;

從第3分到第6分,汽車的速度保持不變,是40千米/時,行駛的路程為40×=2千米,C錯;

從第9分到第12分,汽車對應的速度分別是60千米/時,0千米/時,所以汽車的速度從60千米/時減少到0千米/時,D對.

綜上可得:錯誤的是C.

故選C.

點評:讀函數(shù)的圖象時首先要理解橫縱坐標表示的含義,理解問題敘述的過程,能夠通過圖象得到函數(shù)是隨自變量的增大,知道函數(shù)值是增大還是減小.

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