2019中考数学一轮复习第一部分教材同步复习第三章函数第11讲一次函数权威预测.doc

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1、1第一部分 第三章 第 11讲1如图,在平面直角坐标系 xOy中,过点 A(6,0)的直线 l1与直线 l2: y2 x相交于点 B(m,4)(1)求直线 l1的表达式;(2)直线 l1与 y轴交于点 M,求 AOM的面积解:(1)点 B在直线 l2上,42 m, m2, B(2,4)设直线 l1的表达式为 y kx b,由题意得Error!解得Error!直线 l1的表达式为 y x3.12(2)将 x0 代入 y x3,得 y3, OM3,12 AOM的面积为 OAOM 639.12 122为树立“绿水青山就是金山银山”理念,在建设美丽中国的活动中,某社会团体组织 1 501名志愿者到相关

2、部门规划的林区植树,决定租用当地租车公司共 60辆 A, B两种型号客车作为交通工具下表是租车公司提供给该团体有关两种型号客车的载客量和租金信息.型号 载客量 租金单价A 30人/ 辆 380元 /辆B 20人/ 辆 280元 /辆注:载客量指的是每辆客车最多可载该校师生的人数(1)设租用 A型号客车 x辆,租车总费用为 y元,求 y与 x的函数解析式;(2)哪种租车方案最省钱?解:(1)由题意,得 y380 x280(60 x)100 x16800.(2)由题意,得 30x20(60 x)1501, x30.1, x为整数, x31 时,即租 A型号客车 31辆, B型号客车 29辆最省钱2

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