为了让学生们能更直观地理解乘法公式,王老师准备了一节拼图实验课,她用四个长为a,宽为b的小长方形(如图①所示),拼成了一个边长为
的正方形(如图②所示)观察图形,回答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/1d1d151d-c624-4c1f-9de9-b0d093e031e3.png?resizew=272)
(1)图②中,阴影部分的面积是___________.
(2)观察图①②,请你写出三个式子:
,
,
之间的关系:___________.
(3)应用:已知
,
,求值:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/1d1d151d-c624-4c1f-9de9-b0d093e031e3.png?resizew=272)
(1)图②中,阴影部分的面积是___________.
(2)观察图①②,请你写出三个式子:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/118933cede78675413dbafac24ee008c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/897aeafa8da0737baa70f64fdf55c269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f0281e6bbdbe08beeccb55adf84536.png)
(3)应用:已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b9442c77f394e24f722e626d85d249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdaf43a0b3ae4b8e6f1ba2ec8825ef4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/059d6df06a5b85848dc4fa33327f8e07.png)
22-23八年级上·湖南衡阳·期末 查看更多[3]
湖南省衡阳市衡东县2022-2023学年八年级上学期期末素质教育调研测试数学试题山东省淄博市高青县2022-2023学年六年级下学期期中数学试题(已下线)专题08 实数(十种考法)-【好题汇编】备战2023-2024学年八年级数学上学期期末真题分类汇编(湖南专用)
更新时间:2023-02-12 17:57:50
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相似题推荐
解答题-计算题
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适中
(0.65)
【推荐2】A、实数计算
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81984d402a123f96e3e8adaeba383bf1.png)
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ef17f21bdc9a04d6d7c69f78390d49b.png)
B、解方程组
(1)
(2)
(3)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eff50e33ff188728d4357334185a0cd6.png)
C、解方程
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c96c3bd7621beb33b3dd551ce1fd785d.png)
(2)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81984d402a123f96e3e8adaeba383bf1.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ef17f21bdc9a04d6d7c69f78390d49b.png)
B、解方程组
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7468b2bb88713ce88d6cc0e19eede604.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76a2635989c92885241789e31068807.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eff50e33ff188728d4357334185a0cd6.png)
C、解方程
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c96c3bd7621beb33b3dd551ce1fd785d.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b735f07273ab959f214daef8489713e0.png)
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解答题-问答题
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适中
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【推荐1】若
满足
,求
的值.
解:设
,
,则
,
,
∴
.
请仿照上面的方法求解下面问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/6799f56c-a64d-438e-9dd8-2b191ad007bc.png?resizew=121)
(1)若
满足
,求
的值为______;
(2)若
满足
,则
______;
(3)已知正方形
的边长为
,
,
分别是
、
上的点,且
,
,长方形
的面积是35,分别以
、
作正方形,求阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab855ac4de08bb30a4b4ba1db4a14af2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67bb100e62de3a1c8bbf92230670f58d.png)
解:设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa055db427ecba2024847c4fc79195bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1b74134105b4afa2470945461b8c1dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65d255dd42d622e37df087f58e1716e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7dac88fff1a628faa747f1590c80179.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c703dc8e310f184f7e0c4cbb26aa8009.png)
请仿照上面的方法求解下面问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/6799f56c-a64d-438e-9dd8-2b191ad007bc.png?resizew=121)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b359fc25542ee34415d50d1a98dd8a18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/571667bd69de52a35ed239b9e9d1d590.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c981e1fd14838757dfca2a1dcb140c86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee6f25d87cc57dc4be3f8947c59d01a7.png)
(3)已知正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ce84f6062f12bf6ef42d7b733cd2248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c33132a7eb57dce564b3a2ffc8a202a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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【推荐2】乘法公式的探究及应用:
数学活动课上,老师准备了若干个如图1的三种纸片:A种纸片是边长为a的正方形,B种纸片是边长为b的正方形,C种纸片是长为b、宽为a的长方形.并用A种纸片一张,B种纸片一张,C种纸片两张拼成如图2的大正方形.
方法1: ,方法2: ;
(2)观察图2,请你写出三个代数式
,
,
之间的数量关系: .
(3)根据(2)题中的等量关系,解决如下问题:
①已知
,求
的值.
②已知
,求
的值.
数学活动课上,老师准备了若干个如图1的三种纸片:A种纸片是边长为a的正方形,B种纸片是边长为b的正方形,C种纸片是长为b、宽为a的长方形.并用A种纸片一张,B种纸片一张,C种纸片两张拼成如图2的大正方形.
方法1: ,方法2: ;
(2)观察图2,请你写出三个代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/631758fe5622770196dbf92c7e22e5eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c925be255ca736a53b24d13ddede1a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f0281e6bbdbe08beeccb55adf84536.png)
(3)根据(2)题中的等量关系,解决如下问题:
①已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1f13c046cfb94da06f920ee9033e1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f0281e6bbdbe08beeccb55adf84536.png)
②已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/116e6c12c7604ff96c1a47aef4548d65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af98a8af061ffd1110504037d1219224.png)
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解答题-问答题
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适中
(0.65)
【推荐1】(1)下图中的
是一个长为
、宽为
的长方形,沿图中虚线用剪刀均分成四块小长方形,然后拼成一个如图中的
所示的正方形.请用两种不同的方法求图中
的阴影部分的面积.
方法
:______.方法
:______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
,
,求
和
的值;
已知
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad491e5b5e14c49ef8b7004ebcfcef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d51f9147b8265c0276c1f2c2659197.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
方法
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26bd6e5455614942759d5354b0c9188.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52fb9f7107cd1f637cd04672a102a1e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/631758fe5622770196dbf92c7e22e5eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c925be255ca736a53b24d13ddede1a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0051a5b6ce2ce0a1d4ffe747e687aa1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/416b8636bae5107bd5a4d582bd7934ea.png)
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解答题-问答题
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【推荐2】有一张边长为
厘米的正方形桌面,因为实际需要,需将正方形边长增加
厘米,木工师傅设计了如图所示的三种方案:
.
对于方案一,小明是这样验证的:
因为大正方形的面积可以看成:
,又可以看成![](https://staticzujuan.xkw.com/quesimg/Upload/formula/118933cede78675413dbafac24ee008c.png)
所以
.
解答下列问题:
(1)公式验证:请根据方案二、方案三,分别写出公式的验证过程.
方案二:
方案三:
(2)公式应用,已知实数
,
均为正数,且
,
,求
的值.
![](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/6bd7f8e1006a48eba9ebbafb5b228210.png)
对于方案一,小明是这样验证的:
因为大正方形的面积可以看成:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d29db8183adffc9d4cd5a79dbad3d0f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/118933cede78675413dbafac24ee008c.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bd7f8e1006a48eba9ebbafb5b228210.png)
解答下列问题:
(1)公式验证:请根据方案二、方案三,分别写出公式的验证过程.
方案二:
方案三:
(2)公式应用,已知实数
![](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/11fbf630427da7e2520a3318e9483a40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c03256f5374101853665aa4c1934e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
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