若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1decd163e8a16b96c8158e19a6d5d2cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35183bd761a65f7c8771d234d9e8a71e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a17477b3f4511cc94fda079a8b00b2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438662c15b23a0ecac7f6909f21077e4.png)
更新时间:2019-03-19 09:32:57
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【推荐1】若
与
互为相反数,求(a+b)2005-a2007的值.
![](https://img.xkw.com/dksih/QBM/2016/11/25/1574254673920000/1574254679949312/STEM/b5f29d6fd2594408ab3a3486066bb8bc.png)
![](https://img.xkw.com/dksih/QBM/2016/11/25/1574254673920000/1574254679949312/STEM/ac10729162034a06b8b9dbd1c574dfa2.png)
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【推荐2】如图,点A、B、
在数轴上所对应的有理数分别为a、b、c,满足
,且b是最大的负整数,试解决以下问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/5f1ca8ac-59f9-4187-a5de-1b3eee90f87f.png?resizew=195)
(1)求a、b、c的值;
(2)点P为数轴上的一个动点,其对应的数为x.当点P在点A、B之间运动时,化简:
;
(3)若点A、B、
在数轴上运动,其中,点A以每秒1个单位长度的速度向左运动,同时,点B和点
分别以每秒2个单位长度和3个单位长度的速度向右运动,记点B、
之间的距离为
,点A、
之间的距离为
.假设运动时间为t秒后,
的值不随着时间t的变化而改变,直接写出k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17a300a4c24f776a1705da3f2d2ca234.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/5f1ca8ac-59f9-4187-a5de-1b3eee90f87f.png?resizew=195)
(1)求a、b、c的值;
(2)点P为数轴上的一个动点,其对应的数为x.当点P在点A、B之间运动时,化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eba301fbb897d7950b25045a166a9bb.png)
(3)若点A、B、
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8215e68d8a29bdc760c2a0ab67ee3884.png)
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【推荐3】2021年12月22日国家发展改革委印发了《成渝地区双城经济圈多层次轨道交通规划》,目标实现重庆、成都“双核”间1小时通达.在一条双轨铁路上迎面驶来一快一慢两列火车,快车长
,慢车长
.正在行驶途中的某一时刻,以两车之间的某点
为原点,取水平向右为正方向画数轴,如图,此时快车头
在数轴上表示的数是
,慢车头
在数轴上表示的数是
.若快车
以22个单位长度/秒的速度向右匀速继续行驶,同时慢车
以18个单位长度/秒的速度向左匀速继续行驶,且
与
互为相反数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/20/c4264655-352c-4da3-9745-118c7fef2945.png?resizew=311)
(1)求此时刻快车头
与慢车头
之间相距多少个单位长度?
(2)从此时刻开始算起,再行驶多少秒钟两列火车恰好满足
?
(3)此时在行驶过程中,快车的车尾
上有一位学生
,慢车的车尾
上也有一位学生
.两位学生同时起身以1个单位长度/秒的速度向各自车头跑去,请问几秒之后两位学生的距离为4个单位长度?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dd4997da49b3dfe98144ad13aed0d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e39f786626c66fe376eb08105033f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd2cba53a4838c295d295f8b4b715ff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ff2c210ccfd11ac289835b25c23c6f0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/20/c4264655-352c-4da3-9745-118c7fef2945.png?resizew=311)
(1)求此时刻快车头
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)从此时刻开始算起,再行驶多少秒钟两列火车恰好满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e839ac941e8bf536ff35a12e56c7a400.png)
(3)此时在行驶过程中,快车的车尾
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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【推荐2】计算:
(1)(﹣5)+(﹣4)﹣(+6)﹣(﹣7).
(2)|﹣81|÷2
÷(﹣16).
(3)
.
(4)﹣22
.
(1)(﹣5)+(﹣4)﹣(+6)﹣(﹣7).
(2)|﹣81|÷2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/857961010cb3feb7cdfaecb221e387d8.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6485d3886f55e818950869b832711246.png)
(4)﹣22
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c857fd01dc8d84efae888d438a3f0fa7.png)
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【推荐1】细心观察下列图形(如图),认真分析各式,然后解答问题(
,
,
,…表示各个三角形的面积):
![](https://img.xkw.com/dksih/QBM/2019/8/30/2279989267316736/2280019429883904/STEM/ad51ec2b292242b0adb20eb67a66e284.png?resizew=171)
;
;
;
…
(1)推算出
的长.
(2)请用含有n(n是正整数)的等式表示上述的两个变化规律.
(3)若一个三角形的面积是
,通过计算说明它是第几个三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://img.xkw.com/dksih/QBM/2019/8/30/2279989267316736/2280019429883904/STEM/ad51ec2b292242b0adb20eb67a66e284.png?resizew=171)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/654c52187d3f2eed74c7cae55f941528.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4f48b72329a258cf2c82273574a208.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed4ddd8616cfc9f499de97b63e8945a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/554a870ba0c66752f89e00ae26cc7646.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e6f1f00fc08cb6dc311f797824065e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51417ed5c9681fc9901174af61e2ec91.png)
…
(1)推算出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e58059168dffc56c1f18e7d1090c6feb.png)
(2)请用含有n(n是正整数)的等式表示上述的两个变化规律.
(3)若一个三角形的面积是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
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【推荐2】数学运算中,我们发现:两个数的和与这两个数的差的积.等于这两个数的平方差,即
.这个公式叫做(乘法的)平方差公式.比如:
,
,
,
,
……
利用你发现的规律解答下列问题:
(1)已知
,试比较
与
的大小;
(2)计算:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/620f14e0a432d502246b4aa4ef9743fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd39461ceebb5ded2761c49c4d5a402b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d37c035ac58b6638e47029657f2141a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53a5d1449a21161e2e8521480e984b05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6e472260f02afffbfd03c5c5f342b9.png)
……
利用你发现的规律解答下列问题:
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c0b924e1955878798046de36e034e4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5eeaa30850a2dd1abcb46208ac8b6a2.png)
(2)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c886ba36add4cf96834fa1f4a0795c3.png)
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