实数
在数轴上的位置如图所示,请化简:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663a61ad241d5d874c9a9362f0ee917c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f96f5b35dfb7e6af435f7a334a37b79.png)
更新时间:2024-05-05 22:17:35
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【推荐1】有理数a,b,c在数轴上的位置如图所示:
(1)判断正负,用“
”或“
”填空:
_____0,
_____0,
_____0;
(2)化简
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/29c2535c-50c3-4eb9-93d6-1fbed9da3796.png?resizew=212)
(1)判断正负,用“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7fa17a39f52e09981729af4439ca535.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ea712984ea5017140e20bee226fd5af.png)
(2)化简
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49ae892be84ea569cb07a46c6450745e.png)
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【推荐2】 已知a、b、c在数轴上的位置如图所示,化简:|2a|﹣|a+c|﹣|1﹣b|+|﹣a﹣b|
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/22a1c8ae-5eab-4318-bf9e-57232722a732.png?resizew=233)
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【推荐1】在学习了绝对值的概念后,亮亮同学想要探究两数和的绝对值与这两数绝对值的和的大小关系,尝试比较了下列各式的大小关系:
请用“
”、“
”或“
”填空![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(1)①
______
;
②
______
;
③
______
;
④
______
.
(2)归纳:观察上面的数量关系,可以得到:两数绝对值的和______ 两数和的绝对值(用“大于”、“小于”、“大于或等于”、“小于或等于”、“等于”其中之一填空).
(3)当
时,
、
应满足的条件是______(填写所有正确选项的序号).
①
个正数,
个负数;
②
个正数;
③
个负数;
④
个
,
个正数;
⑤
个
,
个负数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(1)①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17daff29f26cfbaf6856303370535ef2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/928e6768882cb34775f72fc0bca684d3.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c5be257d152304f726e179b602d38f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/988003f6f46eb8d0dd6d5f83a5512c91.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98281b96594ed0c1051f298ba4415897.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/386b42b9be0cdc7f1a03280dd9117d1d.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a7d6ecbfd74c2ca3fc467df1adc78ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/559153c10a3575aa5f1e9abbd2e0953d.png)
(2)归纳:观察上面的数量关系,可以得到:两数绝对值的和______ 两数和的绝对值(用“大于”、“小于”、“大于或等于”、“小于或等于”、“等于”其中之一填空).
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef4f3147db0f8f5fb6c42ab95ff42ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
⑤
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
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【推荐2】如图所示,a、b是有理数,请化简式子|a|﹣|b|+|a+b|+|b﹣a|.
![](https://img.xkw.com/dksih/QBM/2018/11/15/2076012094029824/2076806011895808/STEM/e2d31d3a16384ddc9f45ec773ef75d2d.png?resizew=209)
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【推荐1】先化简,再求值:
,其中
,云山同学的解法如下:
,当
时,
,云山同学的解法正确吗?为什么?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a29e36272e54a04fabf65ea182224692.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8120119749d4bc28067e73fca7d46cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fdfa3af224411df9d9b9da963b66dd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8120119749d4bc28067e73fca7d46cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63975353fdd461caedc566f41c221100.png)
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【推荐2】如图,在
中,按如下步骤尺规作图:
①以点A为圆心,
长为半径画弧;
②以点B为圆心,
长为半径画弧,两弧相交于点D;
③连接
,与
交于点E,连接
,
.
吗?为什么?
(2)分析线段
,
的位置关系;
(3)当
时,请探究四边形
是什么特殊四边形,并证明你的结论;
(4)当
,
,现将四边形
通过割补,拼成一个正方形,那么这个正方形的边长是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
①以点A为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
②以点B为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
③连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f4053258f0dd2d77db2cbce04ade37a.png)
(2)分析线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
(4)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e04947c608f4b7f67b18e8decb05f70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7c310e8859d36c532f2074dde3d934d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
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