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实数的大小比较是初中数学的一个重要内容,特别是两个无理数的大小比较是难点。下面举例说明实数比较大小的方法,帮助同学们提高解题能力。实数比较大小的法则:在数轴上,右边点对应的实数比左边点对应的实数大;正实数大于0,0大于一切负数;两个负数比较大小,绝对值大的反而小。
The comparison of the size of real numbers is an important content of junior high school mathematics, especially the comparison of the size of two irrational numbers is difficult. The following examples illustrate how to compare real numbers to help students improve their problem solving skills. The principle of real number comparison: On the axis, the real number corresponding to the right point is larger than the real number corresponding to the left point; the positive real number is greater than 0,0 greater than any negative number; the two negative numbers are compared and the absolute value is large but small.