What grade did you learn to simplify and evaluate?

The evaluation of simplification began in the first grade of junior high school, and simplification is widely used in physics, chemistry, mathematics and other science and engineering disciplines. Simplification is a very important concept in mathematics. A complex formula must be simplified to find its value simply.

Simplification can be divided into algebraic expression simplification, fractional simplification and solving equations. Simplification of algebraic expressions includes shifting terms, merging similar terms and removing brackets. Solving equations with fraction abbreviated as reduction can also be regarded as a simplified process. Simplified formulas are generally the simplest.

Fraction simplification generally adopts the following methods:

1. First find the median main line and determine the numerator part and denominator part. Then, these two parts are calculated separately, and the calculation result of each part can be restored to the offer score. Finally, it is changed to the form of "numerator part/denominator part", and then the result is obtained.

2. According to the basic properties of fractions, expand the numerator and denominator of complex fractions by the same multiple at the same time (this multiple must be the least common multiple of all denominators of numerator and denominator), so as to remove the denominators of numerator and denominator, and then convert them into the simplest fractions or integers through calculation.