下列说法:①若
为任意有理数,则|a +1|的值总是正的;②若ab>0,a+b<0,则a<0,b<0;③单项式
的系数是
,次数是4;④
是五次四项式.其中错误的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a96eac366f29c339829ea9d95e5cfa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/459c84c9addfbd1cdd0a877ba7c584e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8015b4afbafdeb6e5d093092f7c5ea33.png)
A.1个 | B.2个 | C.3个 | D.4个 |
更新时间:2021-11-10 18:38:22
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【推荐1】若a、b、c为△ABC的三边长,且满足|a﹣4|+(b﹣2)2=0,则c的值可以为( )
A.5 | B.6 | C.7 | D.8 |
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【推荐1】定义新运算:规定运算:
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e25409d76a62c1b12194fe33e96ea6ec.png)
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A.-4 | B.-10 | C.14 | D.4 |
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【推荐2】如图,在数轴上有
两个有理数,则下列结论中,正确的是( )
![](https://img.xkw.com/dksih/QBM/2019/1/25/2126102907166720/2170221706813440/STEM/46ea51f15e68419bba291f1afe95b336.png?resizew=180)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663a61ad241d5d874c9a9362f0ee917c.png)
![](https://img.xkw.com/dksih/QBM/2019/1/25/2126102907166720/2170221706813440/STEM/46ea51f15e68419bba291f1afe95b336.png?resizew=180)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】下列说法错误的是( )
A.单项式a的系数和次数都是1 | B.1是单项式 |
C.![]() ![]() | D.![]() |
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【推荐1】下列说法中,正确的个数是( )
①
表示负数;
②多项式
的次数是
;
③单项式
的次数为
;
④若
,则
;
⑤若
,则
.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5060ad37c403f248c937c1d59af5c71.png)
②多项式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50d3d9674feccd4b9d4c5290e2b7df4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
③单项式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1b5469d205f4a944be02675375f466a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c269a51f37a21e1714e98a431b2100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e541ea2f855f981c96207070683d388.png)
⑤若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f05593ba8313acc1f850a3d2953d7e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92da23aca894ef508dd86a19ae3ca590.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】下列说法:
①最大的负整数是
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;③若a,b互为相反数,则
;④
;⑤单项式
的系数是2;⑥多项式
是关于x,y的三次多项式,其中正确结论有( )
①最大的负整数是
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2c70fcaa661df4fbcad820b439accda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8234fb1861336bfbb7aa4971d2dfdd64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ea313a10d17b3c17c2c56407d4c6fdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8995f1b4d1ee607f70e0f2c6996784.png)
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A.1个 | B.2个 | C.3个 | D.4个 |
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