【九年级】专题练习:数形结合
1.已知∠AOB=30°,C是射线OB上的一点,且OC=4.若以C为圆心,r为半径的圆与射线OA有两个不同的交点,则r的取值范围是______________.
2.对于任意的有理数a,满足a≤x≤a+10的整数x的个数为_________.
![](http://pic.ikafan.com/imgp/L3Byb3h5L2h0dHBzL2ltYWdlMTA5LjM2MGRvYy5jbi9Eb3dubG9hZEltZy8yMDIxLzA2LzI0MTUvMjI0ODM4MTc3XzFfMjAyMTA2MjQwMzQwNDk4NjQ=.jpg)
4.在直角坐标系中,纵、横坐标都是整数的点,称为整点.设k为整数,当一次函数y=x+2与y=kx-4的图象的交点为整点时,k的值可以取 ( )
A.6个 B.7个 C.8个 D.9个
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![](http://pic.ikafan.com/imgp/L3Byb3h5L2h0dHBzL2ltYWdlMTA5LjM2MGRvYy5jbi9Eb3dubG9hZEltZy8yMDIxLzA2LzI0MTUvMjI0ODM4MTc3XzNfMjAyMTA2MjQwMzQwNTA0MTE=.jpg)
![](http://pic.ikafan.com/imgp/L3Byb3h5L2h0dHBzL2ltYWdlMTA5LjM2MGRvYy5jbi9Eb3dubG9hZEltZy8yMDIxLzA2LzI0MTUvMjI0ODM4MTc3XzRfMjAyMTA2MjQwMzQwNTA3Mzk=.jpg)
![](http://pic.ikafan.com/imgp/L3Byb3h5L2h0dHBzL2ltYWdlMTA5LjM2MGRvYy5jbi9Eb3dubG9hZEltZy8yMDIxLzA2LzI0MTUvMjI0ODM4MTc3XzVfMjAyMTA2MjQwMzQwNTE2Nw==.jpg)
![](http://pic.ikafan.com/imgp/L3Byb3h5L2h0dHAvaW1hZ2UxMDkuMzYwZG9jLmNuL0Rvd25sb2FkSW1nLzIwMjEvMDYvMjQxNS8yMjQ4MzgxNzdfNl8yMDIxMDYyNDAzNDA1MTMwMQ==.jpg)
10.小明早晨从家里出发匀速步行去上学.小明的妈妈在小明出发后10分钟,发现小明的数学课本没带,于是她带上课本立即匀速骑车按小明上学的路线追赶小明,结果与小明同时到达学校.已知小明在整个上学途中,他出发后t分钟时,他所在的位置与家的距离为s千米,且s与t之间函数关系的图像如图中的折线段OA—AB所示.
![](http://pic.ikafan.com/imgp/L3Byb3h5L2h0dHAvaW1hZ2UxMDkuMzYwZG9jLmNuL0Rvd25sb2FkSW1nLzIwMjEvMDYvMjQxNS8yMjQ4MzgxNzdfN18yMDIxMDYyNDAzNDA1MTY2MQ==.jpg)
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