1、2.5× 10。
2、50/ 10。
3、 123456789× 10。
4、98765432 1/ 10。
5、(0 12+34)× 10。
Simple calculation is a special kind of calculation, which makes use of the algorithm and the basic properties of numbers, thus making the calculation simple and making it easy to calculate numbers from very complicated formulas. The most commonly used method in simple calculation is multiplication and distribution law. Multiplication and division means ax(b+c)=axb+axc, where A, B and C are arbitrary real numbers.
On the contrary, axb+axc=ax(b+c) is called the inverse application of multiplication and division (also called finding common divisor), especially when A and B are complementary to each other, this method is more useful. Sometimes the law of additive combination is used, for example, a+b+c, and B and C are complementary, so that B and C can be combined and multiplied by A. If+in the above formula is replaced by X, it can also be simply calculated by the multiplicative associative law.
The multiplicative associative law is also a simple method, which is expressed by letters as (a×b)×c=a×(b×c). Its definition (method) is: multiply three numbers, first by the first two numbers, then by the third number; Or multiply the last two numbers first, and then multiply the first number, and the product remains the same.
The order of multiplication operations can be changed, and the application of multiplicative associative law in daily life is not extensive, and it mainly plays a simple role in some complicated operations.
The importance of simple operation
First of all, simple operations can help students solve math problems faster. By using simple operation skills, students can solve the structure and problems of the project more quickly, so as to find a solution to the problem more quickly. This can not only save time, but also enhance students' confidence and interest in learning mathematics.
Secondly, simple operation can improve students' calculation speed and accuracy. Simple operations usually involve some basic mathematical concepts and skills, such as multiplication and exchange law, association law, distribution law and so on. By repeatedly practicing and mastering these concepts and skills, students can complete calculations faster and reduce mistakes.
In addition, simple operations can help students better understand mathematical concepts and principles. By using simple operation skills, students can understand the connotation and application of mathematical concepts and principles more deeply, so as to better master mathematical knowledge.