初中数学的9个基本事实

初中数学的9个基本事实
Basic Facts of Junior High School Mathematics
初中数学的基本事实
The first basic fact is that integers can be divided into positive integers, zero, and negative integers.
第一个基本事实是整数可分为正整数、零和负整数。

The second fact is that rational numbers include integers and fractions.
第二个基本事实是有理数包括整数和分数。

The third fact concerns the properties of real numbers, including commutativity, associativity, and distributivity under addition and multiplication.
第三个基本事实涉及实数的性质，包括加法和乘法下的交换律、结合律和分配律。

The fourth basic fact is that the square of a positive number is positive, while the square of a negative number is also positive. 第四个基本事实是，正数的平方是正数，负数的平方也是正数。

The fifth fact states that the absolute value of a number represents its distance from zero on the number line.
第五个基本事实是，一个数的绝对值表示它在数轴上离零点的距离。

The sixth fact concerns the concept of equality in equations, where two expressions are equal if they have the same value.
第六个基本事实涉及方程中的等式概念，即如果两个表达式具有相同的值，则它们相等。

The seventh basic fact is that the slope of a line represents the rate of change between two variables.
第七个基本事实是，直线的斜率表示两个变量之间的变化率。

The eighth fact deals with the concept of parallel lines, which never intersect and have the same slope.
第八个基本事实涉及平行线的概念，即它们永不相交且具有相同的斜率。

Finally, the ninth basic fact is that the area of a rectangle can be calculated by multiplying its length and width.
最后，第九个基本事实是，矩形的面积可以通过其长度和宽度的乘积来计算。