已知代数式2a-b=7,则-4a+2b+10的值是( )
A.7 | B.4 | C.-4 | D.-7 |
更新时间:2021-01-13 11:21:28
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【知识点】 已知式子的值,求代数式的值解读
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【推荐2】下列说法正确的是( )
①已知
,
,
是非零有理数,若
,则
的值为0或
;
②已知
时,那么
的最大值为8,最小值为
;
③若
且
,则代数式
的值为
.
①已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dc21a7bd135a6951db0448e317714e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f87b056ed87cc2352c09bd52fbd33ccc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
②已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44d16f50c58699f352885df1f7bc9132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d2ee29bfae5d36a408bf9e38def6f26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bf3d3564c61e5e9c39a9e2cf2de048b.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421a473589d5abdd504fdb110828611a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41c2da2f67d817ad248dff8862ba2dd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cda503296f8ac490da9e24156e83265a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6faa377b82f7c39f03875874b78f922b.png)
A.①② | B.①③ | C.②③ | D.①②③ |
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