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(1)在知识竞赛中,如果+10表示加10,那么扣20分怎样表示?

(2)某人转动转盘,如果用+5表示沿用逆时针方向转了5圈,那么沿顺时针方向转了12圈怎样表示?

(3)在某次乒乓球质量检测中,一只乒乓球超出标准质量0.02克记作+0.02,那么-0.03克表示什么?

答案:
解析:

  解:(1)扣20分记作-20分;

  (2)顺时针方向转了12圈记作-12圈;

  (3)-0.03克表示乒乓球的质量低于标准质量0.03克.

  说明:通过三个实例说明如何用正负数表示这种具有相反意义的量.


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