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歡迎您訪問數學考題練習:在數軸上,下面說法不正確的是!

數學考題練習:在數軸上,下面說法不正確的是

更新時間:2024-01-12 16:31:41作者:貝語網校

在數軸上,下面說法不正確的是

A.在兩個有理數中絕對值大的離原點遠

B.在兩個有理數中較大的在右邊

C.在兩個有理數中,較大的離原點遠

D.在兩個負有理數中,較大的離原點近

試題答案

C

試題解析

此題綜合考查了數軸、絕對值的有關內容,用幾何方法借助數軸來求解,非常直觀,且不容易遺漏.

解答:A、正確,數軸上的點到原點的距離,叫做這一點表示的數的絕對值,借助數軸,如,2與-3,2的絕對值是2,-3的絕對值是3,2<3,所以兩個有理數,絕對值大的離原點遠;

B、正確,在數軸上,右邊的數總大于左邊的數;

C、錯誤,如果兩個負有理數,小的離原點遠,如-3與-2;

D、正確,兩個負有理數,絕對值大的反而小,所以大的離原點近.

故選C.

點評:理解絕對值的概念:數軸上的點到原點的距離,叫做這一點表示的數的絕對值,是判斷此類問題的關鍵.

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