什么是正数和负数?
数字是用于测量或计算数量的数学值或数字。它也用数字表示为 3、4、8 等。数字的其他一些例子是整数、整数、自然数、有理数和无理数等。
该系统包括不同类型的数,例如素数、奇数、偶数、有理数、整数等,称为数系统。这些类型的数字可以相应地以数字和文字的形式表示。
例如,55、75等数字以数字的形式表达,也可以写成55、75。
A numeral system or Number system is defined as an elementary system to express numbers and figures. It is the unique way to represent numbers in arithmetic and algebraic structure.
它用于各种算术值,可用于执行日常生活中适用的各种算术运算,如加法、减法、乘法等,以达到计算的目的。数字值由数字、它在数字中的位置值以及数字系统的基数决定。
通常,数字也称为数字,是用于计数、测量、标记和测量基本量的数学值。
数字被分为两种类型:
正数、负数:又分为自然数、有理数、整数、十进制数、整数等不同类型
Positive numbers: Positive numbers are the numbers which are greater than zero that lies on the right side of the number line. Example: 0, 1, 2, 3, 4…
Negative numbers: Negative numbers are the numbers which are less than zero that lies on the left side of the number line. Example: … -5, -4, -3, -2, -1, 0
什么是正数和负数?
回答:
Negative positive is sometimes negative sometimes positive because when we add two digits with the different operand then the resulting sign will be of the higher digit . whether its negative or positive.
Example: If we add -8 & 7 then
– 8 + 7 = -1
If we reverse -7 + 8 = 1
in this way negative positive leads to different result depends on higher operand.
There are certain rules of negative positive
if we add two positive numbers then will get positive number
(+) + (+) = +
if we add one positive and one negative number then higher operand will be the answer
(+) + (-) = ± whichever is on higher side or
if we add two negative numbers then the result will be in negative
(-) + (-) = – or -5 + (-9) = -5 -9 = -14
if we multiply one positive and one negative number then the result will always be negative
5 × (-5) = -25
if we divide one positive and one negative number then the result will always be negative
4/(-2) = -2 or (-4)/2 = -2
示例问题
问题 1:加 5 和 - 7?
解决方案:
If we add one positive and one negative number then higher operand will be the answer .
add 5 & -7
= 5 + (-7)
first open the bracket
= 5 – 7
= -2
问题 2:加 7 和 - 5?
解决方案:
If we add one positive and one negative number then higher operand will be the answer.
add 7 & – 5
= 7 + (-5)
first open the bracket
= 7 – 5
= 2
问题 3:加 - 8 和 - 9。
解决方案:
Add -8 & -9
= -8 + -(9)
First open the brackets
= -8 -9
= -17
问题 4:乘 - 8 × 5?
解决方案:
If we multiply one positive and one negative number then the result will always be negative
therefore = -8 × 5
= -40
问题 5:-8 除以 2?
解决方案:
If we divide one positive and one negative number then the result will always be negative .
therefore
= -8/2
= -4