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数轴是规定了原点、正方向和单位长度的直线.在数轴上,每一个点都表示一个特定的数,而且我们目前学的每一个数都可以用数轴上的一个点表示出来.数轴是数与形的第一次碰撞,是数形结合的基石,在许多场合都有它大显身手的机会.一、有理数与数轴所有的有理数都可以用数轴上的点来表示(学了实数以后就会明白,数轴上的点并不都是表示有理数).这样,就把“数”与“形”(数轴上的点)结合起来了,使抽象的数变得形象、具体.1.在数轴上,原点右边的点表示正数,原点左边的
The number axis is a straight line that defines the origin, the direction of the positive, and the unit length. On a number axis, each point represents a specific number, and every number we learn so far can be represented by a point on the number axis. The first collision with the shape is the cornerstone of the combination of the figures, in many occasions it has the opportunity to show their talents. First, rational numbers and the number of axes All the rational numbers can be used to point on the axis (to learn the real number will understand , Not all points on the axes represent rational numbers.) Thus, the “number” is combined with the “shape” (the points on the axes) to make the abstract number an image, specific .1. On the number axis, the point to the right of the origin represents a positive number, the left of the origin