2013年高考真题分类汇编:考点8 函数的图象 Word版含解析

2013年高考真题分类汇编:考点8 函数的图象 Word版含解析
2013年高考真题分类汇编:考点8 函数的图象 Word版含解析

考点8 函数的图象

1.(2013·福建高考文科·T12)与 (2013·福建高考理科·T8)相同 设函数f(x)的定义域为R ,x 0()00≠x 是f(x)的极大值点,以下结论一定正确的是 ( )

A.?x ∈R ,f(x)≤f(x 0)

B.-x 0是f(-x)的极小值点

C.-x 0是-f(x)的极小值点

D.-x 0是-f(-x)的极小值点

【解题指南】)(x f y =与)(x f y --=的图象关于原点对称,结合图象找出结论.

【解析】选 D.()f x --是 ()f x 的图象关于原点对称,00(,())x f x 是极高点,那么00(,()x f x ---就是极低点.

2. (2013·湖北高考文科·T5)

小明骑车上学,开始时匀速行驶,途中因交通堵塞停留了一段时间,后为了

赶时间加快速度行驶. 与以上事件吻合得最好的图象是( )

【解题指南】图象反映出单调性.

【解析】选C.距学校越来越近则图象下降,交通堵塞时距离不变,后加速行

驶,直线斜率变大,直线变陡.

3.(2013·湖南高考理科·T5)函数()2ln

g x x x

=-+

=的图象与函数()245

f x x

的图象的交点个数为()

A.3 B.2 C.1 D.0

【解题指南】本题只要能在同一坐标系中作出这两个函数的图象即可得到答案.

【解析】选B.在同一坐标系中作出f(x)=2㏑x和g(x)=x2-4x+5的图象就看出有两交点.

4.(2013·湖南高考文科·T6)函数f(x)=㏑x的图像与函数g(x)=x2-4x+4的图像的交点个数为()

A.0

B.1

C.2

D.3

【解题指南】本题只要能在同一坐标系作出这两个函数的图像即可得到答案【解析】选C,在同一坐标系中作出f(x)=㏑x和g(x)=x2-4x+4的图像就看出有两交点

5.(2013·江西高考理科·T10)如图,半径为1的半圆O与等边三角形ABC夹在两平行线

l,2l之间,l//1l,l与半圆相交于F,G两点,与三角形ABC

1

两边相交于E,D两点.设弧FG的长为x(0<x<π),y=EB+BC+CD,若l从

l平

1

行移动到

l,则函数y=f(x)的图像大致是( )

2

【解题指南】注意到弧FG所对的圆心角为x,可构造y关于x的三角函数,

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【解析】升降机先做加速运动,后做匀速运动,最后做减速运动,在加速阶段,所需时间 ,通过的位移为,在减速阶段与加速阶段相同,在匀速阶段所需时间为:,总时间为:,故C正确,A、B、D错误;故选C。 【点睛】升降机先做加速运动,后做匀速运动,最后做减速运动,根据速度位移公式和速度时间公式求得总时间。 3.(多选)甲、乙两汽车同一条平直公路上同向运动,其速度—时间图像分别如图中甲、乙两条曲线所示。已知两车在t2时刻并排行驶,下列说法正确的是() A. 两车在t1时刻也并排行驶 B. t1时刻甲车在后,乙车在前 C. 甲车的加速度大小先增大后减小 D. 乙车的加速度大小先减小后增大 【来源】2018年普通高等学校招生全国统一考试物理(全国II卷) 【答案】 BD 点睛:本题考查了对图像的理解及利用图像解题的能力问题

4.(多选)地下矿井中的矿石装在矿车中,用电机通过竖井运送至地面。某竖井中矿车提升的速度大小v随时间t的变化关系如图所示,其中图线①②分别描述两次不同的提升过程,它们变速阶段加速度的大小都相同;两次提升的高度相同,提升的质量相等。不考虑摩擦阻力和空气阻力。对于第①次和第②次提升过程, A. 矿车上升所用的时间之比为4:5 B. 电机的最大牵引力之比为2:1 C. 电机输出的最大功率之比为2:1 D. 电机所做的功之比为4:5 【来源】2018年全国普通高等学校招生统一考试物理(全国III卷) 为2∶1,选项C正确;加速上升过程的加速度a1=,加速上升过程的牵引力F1=ma1+mg=m(+g),减速上升过程的加速度a2=-,减速上升过程的牵引力F2=ma2+mg=m(g -),匀速运动过程的牵引力F 3=mg。第次提升过程做功W1=F1××t0×v0+ F2××t0×v0=mg v0t0;第次提升过 程做功W2=F1××t0×v0+ F3×v0×3t0/2+ F2××t0×v0 =mg v0t0;两次做功相同,选项D错误。

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阅读理解 专题一广告信息类 2018年 Passage 1 2018全国卷Ⅰ,6分话题:骑自行车在华盛顿特区观光词数:274 Washington,D.C. Bicycle Tours Cherry Blossom Bike Tour in Washington, D.C. Duration:3 hours This small group bike tour is a fantastic way to see the world-famous cherry trees with beautiful flowers of Washington, D.C. Your guide will provide a history lesson about the trees and the famous monuments where they blossom. Reserve your spot before availability —and the cherry blossoms — disappear! Washington Capital Monuments Bicycle Tour Duration:3 hours(4 miles) Join a guided bike tour and view some of the most popular monuments in Washington, D.C. Explore the monuments and memorials on the National Mall as your guide shares unique facts and history at each stop. Guided tour includes bike, helmet, cookies and bottled water. Capital City Bike Tour in Washington, D.C. Duration:3 hours Morning or Afternoon, this bike tour is the perfect tour for D.C. newcomers and locals looking to experience Washington, D.C. in a healthy way with minimum effort. Knowledgeable guides will entertain you with the most interesting stories about Presidents, Congress, memorials, and parks. Comfortable bikes and a smooth tour route(路线) make cycling between the sites fun and relaxing. Washington Capital Sites at Night Bicycle Tour Duration:3 hours(7 miles) Join a small group bike tour for an evening of exploration in the heart of Washington, D.C. Get up close to the monuments and memorials as you bike the sites of Capitol Hill and the National Mall. Frequent stops are made for photo taking as your guide offers unique facts and history. Tour includes bike, helmet, and bottled water. All riders are equipped with reflective vests and safety lights. 1. Which tour do you need to book in advance? A. Cherry Blossom Bike Tour in Washington, D.C. B. Washington Capital Monuments Bicycle Tour. C. Capital City Bike Tour in Washington, D.C. D. Washington Capital Sites at Night Bicycle Tour. 2. What will you do on the Capital City Bike Tour? A. Meet famous people. B. Go to a national park. C. Visit well-known museums. D. Enjoy interesting stories. 3. Which of the following does the bicycle tour at night provide? A. City maps. B. Cameras. C. Meals.

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2019年高考真题分类汇编(全)

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