年级 | 科目 | 问题描述 | 提问时间 |
六年级 | 数学 | 数学 | 2017-10-06 10:31:29 |
下列说法①-a一定是负数;②一个数的绝对值越大,表示它的点在数轴上离原点越远; ③如果a+b=0,那么a与b互为相反数;④正有理数和负有理数统称为有理数;⑤平方等于本身的数只有0,其中正确的有( )· | |||
学点点涂老师 2017-10-06 12:26:55 | |||
1,若a≤0,则-a为非负数,故本选项错误; 2,一个数的绝对值即表示它的点在数轴上离原点的距离,所以,一个数的绝对值越大,表示它的点在数轴上离原点越远,故本选项正确; 3,由a+b=0,得a=-b. 即两个数互为相反数. 4,错误,还有0 5,错误,还有1 | |||
严懿 2017-12-03 11:00:34 | |||
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