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歡迎您訪問數學考題練習:星期天,小王去朋友家借書,下圖是他離家的距離y!

數學考題練習:星期天,小王去朋友家借書,下圖是他離家的距離y

更新時間:2024-01-12 16:28:25作者:貝語網校

星期天,小王去朋友家借書,下圖是他離家的距離y(千米)與時間x(分鐘)的函數圖象,根據圖象信息,下列說法正確的是

A.小王去時的速度大于回家的速度

B.小王在朋友家停留了10分鐘

C.小王去時所花的時間少于回家所花的時間

D.小王去時走上坡路,回家時走下坡路

試題答案

B

試題解析

根據圖象上特殊點的坐標和實際意義即可求出答案.

解答:小王去時的速度為:2÷20=0.1千米/分,回家的速度為:2÷(40-30)=0.2千米/分,所以A、C均錯.小王在朋友家呆的時間為:30-20=10,所以B對.

故選B.

點評:應根據所給條件進行計算得到最佳答案,注意排除法的運用.

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