2018年秋九年级数学上册第六章反比例函数6.1反比例函数课时训练(新版)北师大版.doc

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1、1第六章 反比例函数6.1 反比例函数【基础练习】一、填空题:1.A、B 两地相距 120千米,一辆汽车从 A地去 B地,则其速度 v(千米/时)与行驶时间 t(小时)之间的函数关系可表示为 ;2.有一面积为 60的梯形,其上底长是下底长的 ,设下底长为 x,高为 y,则 y与 x13的函数关系式是 ;3.已知 y与 x成反比例,并且当 x = 2时, y = -1,则当 x = -4时, y = .二、选择题:1.下列各问题中的两个变量成反比例的是( ) ;A.某人的体重与年龄 B.时间不变时,工作量与工作效率C.矩形的长一定时,它的周长与宽 D.被除数不变时,除数与商2.已知 y与 x成反

2、比例,当 x = 3时, y = 4,那么当 y = 3时, x的值为( ) ;A. 4 B. -4 C. 3 D. -33.下列函数中,不是反比例函数的是( ).A. xy = 2 B. y = - (k0) C. y = D. x = 5y-1k3x 3x-1三、解答题:1.一水池内有污水 60m3,设放净全池污水所需的时间为 t (小时) ,每小时的放水量为 wm3,(1)试写出 t与 w之间的函数关系式, t是 w反比例函数吗?(2)求当 w = 15时, t的值.2.已知 y是 x的反比例函数,下表给出了 x与 y的一些值:(1)写出这个反比例函数表达式;(2)将表中空缺的 x、 y

3、值补全.【综合练习】举出几个日常生活中反比例函数的实例.【探究练习】已知函数 y = y1 +y2, y1与 x成正比例, y2与 x成反比例,且当 x = 1时, y = 4,当 x = 2时, y = 5. 求 y关于 x的函数解析式. x -5 -3 -2 1 4 5y -34-1 -33212第六章 反比例函数1. 反比例函数【基础练习】一、1. v = ; 2. y = ; 3. . 二、 1. D; 2. A; 3. C. 三、1. (1) t = 120t 90x 12, (2) t = 4. 2. (1) y = ;(2)从左至右: x = -4,-1,2,3; y = - ,- ,3, . 60w 3x 35 32 34 35【综合练习】略.【探究练习】 y = 2x + .2x

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