负数的加减规则是什么?
代数可以定义为处理各种数学符号的研究、更改和分析的数学分支。它是对未知量的研究,通常在数学中借助变量来描述。代数有大量的公式和恒等式,用于研究涉及变量的情况。它还有线性代数、高级代数、交换代数等各种分支。
数字
数字被定义为可以应用各种数学运算符(例如加法、减法、乘法和除法)的量。数字不仅用于数学实践,而且在我们的日常生活中也起着至关重要的作用。会计、经济、金融、股票市场、市场营销等领域也使用数字作为分析和解释的主要工具。
负数
在数学中,落在实数轴上的数字零左侧的数字称为负数。它们在零左侧的位置表明它们的值小于零的值,因此它们前面写有减号 (-)。
上图描绘了一条显示一些正整数和负整数的数轴。零右边的数字,即正数,其值从左到右不断增加。而零左边的数字(负数)从右到左继续减小值或从左到右增加值。因此,-1 > -2。因此,这里可以形成一个一般规则:
-(a) > -(a + 1)
负数的加减规则是什么?
解决方案:
For beginners, it is convenient to use a number line when performing addition and subtraction on negative numbers. To add and subtract, start by counting from zero on the number line. If the number from which the other number is being subtracted is negative, then start adding from zero towards left until the said number is obtained. Now, from that number start counting further towards left until the number which is to be subtracted is obtained.
Example: Solve: −1 + (− 2).
Step 1. Count one place towards left from zero.
Step 2. Count two places further towards the left from −1.
This shows that: −1 + (− 2) = −3.
类似问题
问题 1. 求解 -1 - ( - 2)。
解决方案:
−1 − (−2) = −1 + 2
Step 1. Count one place towards left from zero.
Step 2. Count two places towards the right from −1.
This shows that: −1 − (−2) = 1.
问题 2。求解 -2 - (-3)。
解决方案:
−2 − (−3) = −2 +3
Step 1. Count two places towards left from zero.
Step 2. Count three places towards the right from −2.
This shows that: −2 +3 = 1.
问题 3. 求解 -1 + (-4)。
解决方案:
Step 1. Count one place towards left from zero.
Step 2. Count 4 places towards the left from −1.
This shows that: −1 + (−4) = −5.
问题 4. 求解 -1 + (-3)。
解决方案:
Step 1. Count one place towards left from zero.
Step 2. Count 3 places towards the left from −1.
This shows that: −1 + (−3) = −4.
问题 5. 求解 -2 + 4。
解决方案:
Step 1. Count two places towards left from zero.
Step 2. Count 4 places towards the right from −2.
This shows that −2 + 4 = 2.