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八年级数学填空题一般
题目
在平面直角坐标系xOyxOy中,对于图形GG给出如下定义:将图形GG上的任意点P(a,b)P\left(a,b\right)变为点P\’(ab,a+b){P\’}\left(a-b,a+b\right),称P\’{P\’}为点PP的关联点.图形GG上所有的点按上述方法变化后得到的点组成的图形记为图形NN,称图形NN为图形GG的关联图形.
(1)(1)(1,0)\left(1,0\right)的关联点的坐标为______;
(2)(2)直线y=x+1y=x+1的关联图形上任一点的横坐标为______;
(3)(3)如图,点A(1,0)A\left(1,0\right),B(1,1)B\left(1,1\right),C(0,1)C\left(0,1\right).若四边形OABCOABC的关联图形与过点(4,3)\left(4,3\right)的直线y=kx+n(k0)y=kx+n\left(k\neq 0\right)有公共点,直接写出kk的取值范围.
知识点:圆的综合题章节:未标注

答案与解析

答案

(1)由题意,根据关联点的意义,
\therefore(1,0)\left(1,0\right)的关联点的坐标为(10,1+0)\left(1-0,1+0\right),即(1,1)\left(1,1\right).
故答案为:(1,1)\left(1,1\right).
(2)(2)由题意,根据关联点的意义,\because直线y=x+1y=x+1的点为(x,x+1)\left(x,x+1\right)
\therefore直线y=x+1y=x+1的关联图形上任一点的横坐标为:x(x+1)=1x-\left(x+1\right)=-1.
故答案为:1-1.
(3)(3)由题意,根据关联点的意义,
A(1,0)\therefore A\left(1,0\right)的关联点A\’(1,1){A\’}\left(1,1\right)B(1,1)B\left(1,1\right)的关联点B\’(0,2){B\’}\left(0,2\right)C(0,1)C\left(0,1\right)的关联点C\’(1,1){C\’}\left(-1,1\right).
O(0,0)O\left(0,0\right)的关联点O(0,0)O\left(0,0\right)
\therefore作出四边形OABCOABC的关联图形OA\’B\’C\’OA\’{B\’}{C\’}.

根据图象,当直线过(4,3)\left(4,3\right)B\’(0,2){B\’}\left(0,2\right)时,k=14k=\frac{1}{4}
当直线过(4,3)\left(4,3\right)O(0,0)O\left(0,0\right)时,k=34k=\frac{3}{4}
\therefore四边形OABCOABC的关联图形与过点(4,3)\left(4,3\right)的直线y=kx+n(k0)y=kx+n\left(k\neq 0\right)有公共点,则14k34\frac{1}{4}\leqslant k\leqslant \frac{3}{4}.

解析

(1)由题意,根据关联点的意义,
\therefore(1,0)\left(1,0\right)的关联点的坐标为(10,1+0)\left(1-0,1+0\right),即(1,1)\left(1,1\right).
故答案为:(1,1)\left(1,1\right).
(2)(2)由题意,根据关联点的意义,\because直线y=x+1y=x+1的点为(x,x+1)\left(x,x+1\right)
\therefore直线y=x+1y=x+1的关联图形上任一点的横坐标为:x(x+1)=1x-\left(x+1\right)=-1.
故答案为:1-1.
(3)(3)由题意,根据关联点的意义,
A(1,0)\therefore A\left(1,0\right)的关联点A\’(1,1){A\’}\left(1,1\right)B(1,1)B\left(1,1\right)的关联点B\’(0,2){B\’}\left(0,2\right)C(0,1)C\left(0,1\right)的关联点C\’(1,1){C\’}\left(-1,1\right).
O(0,0)O\left(0,0\right)的关联点O(0,0)O\left(0,0\right)
\therefore作出四边形OABCOABC的关联图形OA\’B\’C\’OA\’{B\’}{C\’}.

根据图象,当直线过(4,3)\left(4,3\right)B\’(0,2){B\’}\left(0,2\right)时,k=14k=\frac{1}{4}
当直线过(4,3)\left(4,3\right)O(0,0)O\left(0,0\right)时,k=34k=\frac{3}{4}
\therefore四边形OABCOABC的关联图形与过点(4,3)\left(4,3\right)的直线y=kx+n(k0)y=kx+n\left(k\neq 0\right)有公共点,则14k34\frac{1}{4}\leqslant k\leqslant \frac{3}{4}.

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