北京市各区2016年中考数学一模汇编直线20190221260.doc

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1北京市 2016 年各区中考一模汇编直线1.【2016 东城一模,第 10 题】如图,点 A 的坐标为(0,1),点 B 是 x轴正半轴上的一动点,以 AB 为边作等腰 Rt ABC,使 BAC=90,设点 B 的横坐标为 x,设点 C 的纵坐标为 y,能表示 与 x的函数关系的图象大致是2.【2016 东城一模,第 12 题】请你写出一个一次函数,满足条件: 经过第一、三、四象限; 与 y 轴的交点坐标为 1 2(0 ,-1 ). 此一次函数的解析式可以是3.【2016 通州一模,第 05 题】在一定温度下向一定量的水中不断加入食盐(NaCl),那么能表示食盐溶液的溶质质量分数 y 与加入的食盐(NaCl)的量 x 之间的变化关系的图象大致是4.【2016 通州一模,第 12 题】写出图象经过点(-1,1)的一个函数的表达式是_.5.【2016 西城一模,第 13 题】已知函数满足下列两个条件:当 0x时, y随 x的增大而增大; 它的图象经过点1,2,请写出一个符合上述条件的函数的表达式_D.C.B.A. xyxyxyyx OOOO2详细解答1. A2. -1yx答案不唯一3. C4. 、 (答案不唯一);5. y=2x (答案不唯一);

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