数轴是体现数形结合思想的一种重要工具,只有掌握好它的数形结合思想,才能灵活地运用数轴的多功能性·在此略举几例,谈如何运用数轴·一、利用数轴表示一切实数例1在数轴上表示出下列各数:-3·5,-1,0,4,2,221分析:所有的实数都可以用数轴上的点表示·要在数轴上表示出所给出的 Axis is an important tool that embodies the concept of combination of number and shape. Only by grasping the combination of number and shape, can we flexibly use the versatility of several axes. Here are a few examples to illustrate how to use numerical axis. A practical example 1 shows the following numbers on the number axis: -3·5, -1, 0, 4, 2, 221 Analysis: All real numbers can be represented by points on the axis. · Numbers should be given on the axis