下列计算正确的是( )
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-06-16 07:51:46
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【推荐1】下列计算正确的是( )
A.a3•a2=a6 | B.3a•4a=12a | C.(﹣a3)4=a12 | D.a8÷a2=a4 |
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【推荐1】已知A=
,B是多项式,在计算B-A时,小海同学把B-A错看成了B÷A,结果得
,那么B-A的正确结果为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc5b3d9241859a4b420e56818a7649c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】有7张长为
,宽为
的小长方形纸片,如图方式不重叠地放在长方形
内,未被覆盖的部分(两个矩形)用阴影表示.设左上角与右下角的阴影部分的面积的差为
,当
的长度变化时,按照同样的放置方式,
始终保持不变,则
满足 ( )
![](https://img.xkw.com/dksih/QBM/2021/1/31/2647876305780736/2683463912308736/STEM/641cf2fa-e617-478b-a50d-4a5360bef1f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cc1ee7f9f3c497125ee3f9e44db9688.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://img.xkw.com/dksih/QBM/2021/1/31/2647876305780736/2683463912308736/STEM/641cf2fa-e617-478b-a50d-4a5360bef1f1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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