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以江苏教育出版社(以下简称“苏教版”)出版的普通高中课程标准实验教科书数学(必修)上的几个例题与习题为例,谈谈如何抓住数学题的变化,体会教材的含义,提高解答数学题的能力,体验数学的乐趣.我们先看《必修2》(苏教版)第97页例2已知隧道的截面是半径为4 m的半圆,车辆只能在道路中心线一侧行驶,一辆宽2.7 m,高3 m的货车能不能驶入这个隧道?解以某一截面半圆的圆心为坐标原点,半圆的直径AB所在直线为x轴,建立直角坐标系,那么半圆的方程为
Taking the examples and exercises of mathematics (compulsory) for ordinary high school curriculum standard experimental textbooks published by Jiangsu Education Publishing House (hereinafter referred to as “Sujiao Edition”) as an example, how to seize the changes of math problems and understand the teaching materials The meaning of improving the ability to answer math problems, experience the fun of mathematics. We first look at “Compulsory 2” (Su) If the cross section of a tunnel is known as a semicircle with a radius of 4 m, the vehicle can only be on the road Center line of a side, a width of 2.7 m, 3 m high truck can enter the tunnel? Solution to a cross-section of a circle center of the circle as the origin of coordinates, the semicircular diameter AB where the straight line is the x-axis, the establishment of rectangular coordinate system , Then the semicircle equation is