下列等式的变形中,正确的有( )
①由
得
;②由a=b得,-a=-b;③由
得
;④由
得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98beee5bdd534aab3b8bb8caaf4193df.png)
①由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f1907108d78575b92363b8b025884d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18ace82d9a163e2dc42dc5ab45746b10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f85bec62c98e091ca791fe78052401f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f22fec5a381ae8aca93d876e54c79de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0a4480988244a9d04ec293975db2cc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98beee5bdd534aab3b8bb8caaf4193df.png)
A.1个 | B.2个 | C.3个 | D.4个 |
更新时间:2020-04-18 20:44:24
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单选题
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适中
(0.65)
【推荐1】已知等式a=b,那么下列变形不正确的是( )
A.2a+c=2b+c | B.﹣3a﹣c=﹣3b﹣c | C.2ac=2bc | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐2】下列各项中叙述正确的是
A.若![]() ![]() |
B.若![]() ![]() |
C.若![]() ![]() |
D.若![]() ![]() |
您最近一年使用:0次