What Is Negative Attention?

Negative numbers are mathematical terms. Numbers smaller than 0 are called negative numbers. Negative numbers and positive numbers represent quantities with opposite meanings. Negative numbers are marked with a minus sign (minus sign) "-" and a positive number, such as 2, which represents the opposite number of 2. Therefore, any positive number followed by a negative sign becomes a negative number. A negative number is the opposite of its absolute value. On the number axis, negative numbers are all on the left side of 0. The earliest record of negative numbers is the nine-chapter arithmetic in ancient China. In the calculation chip, "positive calculation is red, negative calculation is black", that is, red calculation is used to indicate positive numbers, and black indicates negative numbers. Two negative numbers are relatively large, but the absolute value is large but small.

Example 1

We have learned natural numbers in elementary school; if there is no object, we use 0 to represent it. Measurement and calculation sometimes cannot be obtained.

People often encounter various quantities of opposite significance in life. For example, there are surpluses and losses in bookkeeping; when calculating grain storage in a silo, sometimes grain is recorded and sometimes grain is recorded. For convenience, people consider numbers with opposite meanings to represent. So people introduced the concept of positive and negative numbers, counting surplus money into food as positive, and losing money and food as negative. It can be seen that positive and negative numbers are produced in production practice.

According to historical records, as early as more than 2,000 years ago, China had the concept of positive and negative numbers and mastered the algorithms for positive and negative numbers. When people make calculations, they use various small bamboo sticks to put out various numbers for calculation. For example, 356 is put into |||, 3056 is put into it, and so on. These little bamboo sticks are called "

Negative numbers can be widely used in such aspects as temperature, floor, elevation, water level, profitability, increase / decrease, expenditure / revenue, score / deduction, and so on. Now in the sixth grade of elementary school. (I also learned in the first day).

+

Negative number 1 + negative number 2 =-(negative number 1 + negative number 2) = negative number

Negative + positive = sign takes the sign of the larger absolute value and the sign of the addend, and the value takes the value obtained by "subtracting the smaller absolute value from the larger absolute value"

-

Negative number 1-negative number 2 = negative number 1 + (negative number 2) = negative number 1 plus negative number 2 inverse, and then calculate by negative number plus positive number

Negative number-positive number =-(positive number + negative number) = negative number Subtracting two numbers with the same sign is equal to adding their absolute values

X

Negative number 1 × negative number 2 = (negative number 1 × negative number 2) = positive number

Negative number × positive number =-(positive number × negative number) = negative number

÷

Negative number 1 ÷ negative number 2 = (negative number 1 ÷ negative number 2) = positive number

Negative number ÷ positive number =-(negative number ÷ positive number) = negative number

In short, the same number is equal to a positive number, and the other number is equal to a negative number.