观察下列两个等式:2﹣
=2×
+1,5﹣
=5×
+1,给出定义如下
我们称使等式a﹣b=ab+1成立的一对有理数“a,b”为共生有理数对”,记为(a,b)
(1)通过计算判断数对“﹣2,1”,“4,
”是不是“共生有理数对”;
(2)若(6,a)是“共生有理数对”,求a的值;
(3)若(m,n)是“共生有理数对”,则“﹣n,﹣m” “共生有理数对”(填“是”或“不是”),并说明理由;
(4)若(m,n)是“共生有理数对”(其中n≠1),直接用含n的代数式表示m.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
我们称使等式a﹣b=ab+1成立的一对有理数“a,b”为共生有理数对”,记为(a,b)
(1)通过计算判断数对“﹣2,1”,“4,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
(2)若(6,a)是“共生有理数对”,求a的值;
(3)若(m,n)是“共生有理数对”,则“﹣n,﹣m” “共生有理数对”(填“是”或“不是”),并说明理由;
(4)若(m,n)是“共生有理数对”(其中n≠1),直接用含n的代数式表示m.
19-20七年级上·江苏连云港·阶段练习 查看更多[3]
江苏省连云港市灌云县2019-2020学年七年级上学期10月月考数学试题(已下线)专题冲刺小卷01 实数-2020年《三步冲刺中考·数学》之最新模考分类冲刺小卷(全国通用)2019年河北省保定市中考第三次模拟数学试题
更新时间:2019-10-16 08:40:26
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【知识点】 新定义下的实数运算
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解答题-问答题
|
较难
(0.4)
【推荐1】定义:在平面直角坐标系中,对于任意
,若点
满足
,则称点M是点P,Q的“美妙点”.例如:点
,当点
满足
时,则点
是点P,Q的“美妙点”.
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(1)已知点
,请说明其中一点是另外两点的“美妙点”;
(2)如图,已知点D是直线
上的一点.点
,点
是点D、E的“美妙点”.
①求y与x的函数关系式;
②若直线
与x轴相交于点F,当
为直角三角形时,求点D的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdd413eac4a977b6859cea943a96155d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51a8eb194c397afdb40737d432f87266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10a3b1e839654e2c2e94ffedd6438cee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d9b39596830298071074f6c3faf0e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51a8eb194c397afdb40737d432f87266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f297704fffe26db84a95033a801e28bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c54b37c7673f0e975343b96acf0afa6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/19/3e458688-7a7e-4e2a-9162-f1f82f1fb9df.png?resizew=229)
(1)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bfb8f2770b49046f0795ea80c356660.png)
(2)如图,已知点D是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8e2fa0e4383590afe6d8f1d7aa8bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c493fa574140cae8d85982db2055c82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51a8eb194c397afdb40737d432f87266.png)
①求y与x的函数关系式;
②若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eadb6f330e2d5325adb08c2b1d80b1ae.png)
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【推荐2】阅读:如果两个分式A与B的和为常数k,且k为正整数,则称A与B互为“关联分式”,常数k称为“关联值”. 如分式
,
,
,则A与B互为“关联分式”,“关联值”
.
(1)若分式
,
,判段A与B是否互为“关联分式”,若不是,请说明理由;若是,请求出“关联值”k.
(2)已知分式
,
,C与D互为“关联分式”,且“关联值”
.
①
________(用含x的式子表示);
②若x为正整数,且分式D的值为正整数,则x的值等于________.
(3)若分式
,
(a,b为整数且
),E是F的“关联分式”,且“关联值”
,求c的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d564d8d623db1d218f180b53f9268f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a427db44aee1dc6ff2e95a23963fde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67dadcfd2426a28d6143c3babe34ade2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
(1)若分式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7c503ce0a35cff925d00171759cc128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb07d370b63fb64af124523b8602318.png)
(2)已知分式
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①
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②若x为正整数,且分式D的值为正整数,则x的值等于________.
(3)若分式
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/122509d33723272a2f76f18e0c669a11.png)
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