Arithmetic and calculation power

1. Algorithm is to complete an accurate and complete description of a task. That is to say, given the initial state or input data, the required or expected termination state or output data can be obtained after finite operations of the computer program

"arithmetic" is the general name of all mathematics in ancient China. As for the names of many branches of mathematics, such as geometry and algebra, they came into being very late

the foreign books that systematically collate the predecessors' mathematical knowledge are the earliest of Euclid's the original of geometry in Greece The book consists of 15 volumes, the latter two volumes were supplemented by others. Most of the book belongs to the knowledge of geometry. In the seventh, eighth and ninth volumes, the nature and operation of numbers are specially discussed, which belongs to the content of arithmetic<

the word "arithmetic" in Latin now is derived from the Greek word "number and number (phonetic, SH & #251; The technique of "three tone number" has changed“ In ancient China, the word "Suan" also means "number", which means bamboo chips for calculation. In ancient China, the calculation of complex numbers was based on calculation. So "arithmetic" includes all the mathematical knowledge and calculation skills at that time. The oldest "nine chapters of arithmetic" handed down and the lost "arithmetic" by Xu Shang and "arithmetic" by Du Zhong are the methods to solve various practical mathematical problems.

2. Arithmetic sum is the sum of positive numbers, that is, the sum of absolute values, for example, 2 + 13.5 + 7. All values are positive and additive
it is mainly different from algebraic sum. Algebraic sum is signed, and the + sign before negative number is usually omitted. For example (- 2) + (+ 3) + (- 4) = - 2 + 3-4 is the so-called algebraic sum.

3. A lot of them. You need to know numbers first, and then do arithmetic. You can find many types on the Internet
however, in my opinion, to teach children arithmetic, it's better for parents and teachers to teach at the same time, practice more in daily life, and encourage children often. In this way, children can learn happily, master the methods, and enhance their feelings through communication. Why not
hope to help you, please adopt!

4.

Arithmetic is a branch of mathematics, is the original form of mathematics. Engaged in the study of the nature of real numbers, as well as the relationship between them and operation rules, mainly including addition, subtraction, multiplication, division

arithmetic also means that as a school course, the early primary school textbooks include Mandarin, arithmetic... And later changed to Chinese, mathematics. That is to say, the contents of mathematics in current textbooks include not only arithmetic, but also algebra and geometry

as for the word "arithmetic", it does not belong to the field of mathematics. Please see the dictionary screenshot:

5. Definition of mathematical expectation: 1) the sum of the proct of all possible values Xi and the corresponding probability PI (= XI) of a discrete random variable is called the mathematical expectation of the discrete random variable [1] (let the series be absolutely convergent), denoted as e (x). Mathematical expectation is one of the most basic mathematical characteristics. It reflects the average value of random variable. Also known as expectation or mean. If a random variable only obtains a finite number of values, it is called the mathematical expectation of discrete random variables. It is a generalization of simple arithmetic average, similar to weighted average. 2) Let the probability density function of the continuous random variable X be f (x). If the integral is absolutely convergent, then the value of the integral is called the mathematical expectation of the random variable, denoted as e (x). 2. The relational arithmetic mean comes from the sample. It's similar. Mathematical expectation is the matrix. It's accurate. In the calculation of the expected value, if the classical probability theory is used, the probability corresponding to each data is 1 / N, and N is the number of data. Then the expected value is equal to the arithmetic mean.

6.

You may have heard mom and dad say "math" as "arithmetic.". So, is arithmetic and mathematics the same thing

In fact, arithmetic and mathematics are both related and different

Arithmetic includes addition, subtraction, multiplication and division of integers, decimals and fractions and their application in daily life and proction. In arithmetic, we don't talk about negative numbers or the operation of algebraic expressions composed of letters. If we talk about negative numbers and equations, that's the content of algebra; If we talk about many properties of figures, it's about geometry. Arithmetic, algebra and geometry are all subjects of mathematics. There are many branches of mathematics, such as calculus, number theory, set theory, probability theory and so on

In addition to arithmetic, there are also some elementary knowledge about algebra and geometry in the current primary school mathematics textbooks, so the primary school textbooks are not called arithmetic, but mathematics

7. When the operation result does not overflow, the operation result is equal to the logical result (that is, the correct result that should be obtained). At this time, SF represents the positive and negative of the logical result. When the operation result overflows, the operation result is not equal to the logical result. At this time, the positive and negative situation represented by SF value is opposite to the logical result, that is, when sf0, the logical result is negative, when SF1, the logical result is negative, The logical result is nonnegative

8.

1. Arithmetic sum: arithmetic sum is the sum of all addends that are nonnegative (integers or zeros)

Logic and: logic and is 1101 & amp; 0100 is based on the concept of phase and, and. It can be understood in the same way that a circuit has two switches in series. Only when the two switch circuits are closed at the same time can the circuit be connected. Opening any switch circuit will not work, so the result of the logical sum of those two numbers is 0100

Logic or: logic or, i.e. 1101 | 0100, is based on phase or. It can also be understood that a circuit has two switches in parallel. As long as one switch is closed, the circuit can be connected. Only when two switches are opened at the same time, the circuit will not work. The result was 1101

4. Logical not: logical not is! 1101. This is simple. It's reversed by bit. It's 0010

extended data :

1. Logical constant and variable: there are only two logical constants, namely 0 and 1, which are used to represent two opposite logical states. Like ordinary algebra, logical variables can also be represented by letters, symbols, numbers and their combinations, but there is an essential difference between them, because there are only two values of logical constants, namely 0 and 1, and there is no intermediate value

Logic operation: in logic algebra, there are three basic logic operations: and, or and not. There are many ways to express logic operations, such as statement description, logic algebra, truth table, Karnaugh map and so on

Logical function: a logical function is an algebraic expression which is connected by logical variables and constants through operators. Similarly, logic functions can also be expressed in the form of tables and graphs

Logic Algebra: logic algebra is a mathematical system that studies the operation and simplification of logic functions. The operation and simplification of logic function is the foundation of digital circuit course, and also the key of digital circuit analysis and design

If any or both operands are true, the logical or operator (|) returns a Boolean value of true; Otherwise, it returns false. The operands are implicitly converted to the type bool before calculation, and the type of the result is bool. Logical "or" has relevance from left to right

The

or operator is the equivalent text of |

The operands of the

logical or operators need not be of the same type, but they must be of integer or pointer type. Operands are usually relational or equal expressions

the first operand is fully evaluated, and all side effects are completed before the logical or expression continues to be evaluated

the second operand is calculated only if the result of the first operand is false (0). When the logical or expression is true, this eliminates unnecessary evaluation of the second operand

among the conditions that determine a thing, as long as one condition can be satisfied, the result will appear; Only when all the conditions are not satisfied, the result does not appear. This causal relationship is called "logical or"

for example, if one of the two switches S1 and S2 is closed, the El will be on; Only if the two switches are not closed, the light El will not be on

references : logical operations_ Network

9. you 're right! Computer calculation refers to arithmetic operation and logic operation
arithmetic unit: arithmetic unit in a computer that performs various arithmetic and logical operations. The basic operations of the arithmetic unit include addition, subtraction, multiplication and division, and, or, not, XOR and other logic operations, as well as shift, comparison and transfer operations, also known as arithmetic logic unit (ALU)
the arithmetic logic unit (ALU), accumulator, status register, general register group, etc. The basic functions of Alu are addition, subtraction, multiplication and division, and logical operations such as and, or, not and XOR, as well as shift and complement operations. When the computer is running, the operation of the arithmetic unit and the type of operation are decided by the controller. The data processed by the arithmetic unit comes from the memory; The processed result data is usually sent back to the memory or temporarily stored in the arithmetic unit. Together with control unit, it forms the core of CPU
the processing object of the arithmetic unit is data, so the data length and computer data representation method have a great impact on the performance of the arithmetic unit. In the 1970s, microprocessors used one, four, eight, and sixteen binary bits as the basic unit of data processing. Most general-purpose computers use 16, 32 and 64 bits as arithmetic units to process the length of data. An arithmetic unit that can process all bits of a data at the same time is called a parallel arithmetic unit. If only one bit is processed at a time, it is called serial arithmetic unit. Some arithmetic units can process several bits (usually 6 or 8 bits) at a time, and a complete data is divided into several segments for calculation, which is called serial / parallel arithmetic unit. The arithmetic unit usually processes only one length of data. Some of them can also process data of different lengths, such as half word length operation, double word length operation, quadruple word length operation, etc. Some data length can be specified in the operation process, which is called variable word length operation
the number of operations and operating speed that an arithmetic unit can perform marks the strength of the capability of the arithmetic unit, and even the capability of the computer itself. The basic operation of arithmetic unit is addition. The rule of binary addition is: 0 + 0 = 0, 0 + 1 = 1, 1 + 0 = 1, 1 + 1 = 10. Adding a number to zero is simply transferring the number. To add the code of one number to another is equivalent to subtracting the previous number from the latter. Subtract two numbers to compare their size.

10.

The differences between arithmetic mean and geometric mean are as follows:

1. The forms of their formulas are different:

< H2 > References: < H2 > arithmetic mean network < H2 > geometric mean network