下列说法:①若
,则a为负数;②若
,则a>0>b;③若a>0,a+b>0,ab≤0,则
;④若
,则ab≤0,其中正确的是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/296cba7539ec956247f383743f59354f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369311a30b2344e6e770e3e6bd00b918.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86c2a9f74ed909ee7bdb384ed26443be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe4a4fa7d7ab6fe90ff9e9e57ac9c38d.png)
更新时间:2019-11-07 15:23:26
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【推荐1】①当
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【推荐1】如果a﹣b<0,并且ab<0,|a|>|b|,那么a+b_____ 0.(填“>”或“<”)
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【推荐2】把下列各式写成省略加号的形式.
(1)-7-(-15)+(-3)-(-4)=____________ ;
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab9089a20636f108bc2bbd416fe5f0b.png)
_________
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名校
【推荐1】如果4个不相等的正整数a、b、c、d满足
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【推荐2】如图1,A,B,C是数轴上从左到右排列的三点,在数轴上对应的数分别为
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___ 个单位长度.
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(1)在图1的数轴上,
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