已知整数a,b,c满足
,且其中任意两数之和是第三个数的整数倍,求
所有可能的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca003167949d976cf2d512b5f903cff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca69890d870ac9a79fe891ff57396e37.png)
22-23九年级·江苏南京·自主招生 查看更多[2]
更新时间:2023-10-20 14:32:54
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【推荐1】根据以下素材,探索完成任务.
如何确定酒精喷雾机的有效杀菌距离? | ||
素材1 | 图1是一款电动酒精喷雾机、其上下 喷孔 ![]() ![]() 置的平面.喷雾机正对平面 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | ![]() |
素材2 | 不考虑喷洒过程中酒精在空气中的损耗,喷雾机两孔一次共可喷出酒精![]() ![]() ![]() |
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素材3 | 经过一次喷洒,当被喷洒平面的杀菌百分比达到70%及以上时,杀菌有效 | |
问题解决 | ||
任务1 | 当被喷洒平面![]() ![]() ![]() | |
任务2 | ①当被喷洒平面![]() ![]() ![]() ②当被喷洒平面 ![]() ![]() |
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【推荐2】【提出问题】已知
,且
,
,试确定
的取值范围.
【分析问题】先根据已知条件用
去表示
,然后根据题中已知
的取值范围,构建
的不等式,从而确定
的取值范围,同理再确定
的取值范围,最后利用不等式的性质即可解决问题.
【解决问题】解:
,
.
,
,
.
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a7dd9576353a96930d1a7a8271b02b0.png)
同理,得
.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0e1cc087fe7fcc714a186942a7f34ff.png)
由
,得
,
的取值范围是
.
【尝试应用】(1)已知
,且
,
,求
的取值范围;
(2)已知
,
,若
成立,求
的取值范围
结果用含
的式子表示
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d30da5fc9a321009c48ddff89aad061.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52c6cf9152e0d02b83eb22b01722d29c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/027e73e95bec089600b3dd7e2a32a3ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cbc8207d75822c19a9aad4aa0c18814.png)
【分析问题】先根据已知条件用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
【解决问题】解:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5650c97f4e8d23312abc9074b750369.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d11caa71e80b0f5569f4386ba5ba2f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e80a851638ed6c763fd287474eda5f00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5f9884826c3bcc090b4a7245c17ce44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3348480e6e94d980bd32f04e9bf5f77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fab789f12b8e13504299a7f6bfc260b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72047b526cf2136941ebe634f38625c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a7dd9576353a96930d1a7a8271b02b0.png)
同理,得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a500891d1608a435514fd12411c2057c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0e1cc087fe7fcc714a186942a7f34ff.png)
由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28b31daf2ba9ac76c0e0aca4453d435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9212297c408715e5c213182e95ce6edb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f9cd3a338a71fb9e73485a49fc064a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d69a97335bca3c23f0951d6016aeb96c.png)
【尝试应用】(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25660551c64f3f8a7cb836b089655a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c389521504a8f1446495d2c8a33a54d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a14b4329b17b7127a947c973ad0ea249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cbc8207d75822c19a9aad4aa0c18814.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a14b4329b17b7127a947c973ad0ea249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c389521504a8f1446495d2c8a33a54d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d0c3afc07b5e4fe0ad0de2db1dde6d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cbc8207d75822c19a9aad4aa0c18814.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
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【推荐3】在平面直角坐标系中,对于任意三点A,B,C的“矩面积”,给出如下定义:
“水平底”a为任意两点横坐标差的最大值,“铅垂高”h为任意两点纵坐标差的最大值,则“矩面积”
.
已知:如图,
.
,则A,B,C三点的“水平底”
,“铅垂高”
,“矩面积”
__________;
(2)点P在x轴上,若A,B,P三点的“矩面积”为10,则点P的坐标为_______;
(3)点
,
①若A,B,M三点的“矩面积”为8,直接写出满足题意的m的最大值;
②若
,直接写出A,B,M三点的“矩面积”S的取值范围.
“水平底”a为任意两点横坐标差的最大值,“铅垂高”h为任意两点纵坐标差的最大值,则“矩面积”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09665a97106abb423f5f7ed190fc8aae.png)
已知:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c515a75eabff1a80c5e47941c5e4480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5077dd5e584beda91f6e083c26036c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab839d8569171afab5ed55c22013aa72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8db8814b2124793c2bdf3ea701fb14ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7880a7c697773b7fc21a95318d87c6ff.png)
(2)点P在x轴上,若A,B,P三点的“矩面积”为10,则点P的坐标为_______;
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91097475f48628fadf7d2222c8d71536.png)
①若A,B,M三点的“矩面积”为8,直接写出满足题意的m的最大值;
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e34f42b3be15518c29e3689c9fe6d6d.png)
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