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歡迎您訪問數學考題練習:如果ab<0,a+b>0,以下說法正確的是!

數學考題練習:如果ab<0,a+b>0,以下說法正確的是

更新時間:2024-01-12 14:10:53作者:貝語網校

如果ab<0,a+b>0,以下說法正確的是

A.a、b兩數同號

B.a、b兩數異號

C.a、b異號且正數的絕對值大于負數的絕對值

D.a、b異號且負數的絕對值大于正數

試題答案

C

試題解析

由ab<0,根據有理數的乘法法則,可知a、b異號,又a+b>0,根據有理數的加法法則,可知正數的絕對值大于負數的絕對值.

解答:∵ab<0,

∴a、b異號,

又∵a+b>0,

∴正數的絕對值大于負數的絕對值.

故選C.

點評:本題主要考查了有理數的乘法符號法則與絕對值不相等的異號兩數相加的符號法則.

有理數的乘法符號法則:兩數相乘,同號得正,異號得負.

絕對值不相等的異號兩數相加,和與絕對值較大的加數符號相同.

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