1, splitting terminology
Split term method, which is the concrete application of the idea of decomposition and combination in the summation of series. It is to decompose each item (general item) in the sequence, and then recombine it, so that it can eliminate some items and finally achieve the purpose of summation. The relationship between multiples of general term decomposition (split term). Usually used in algebra, fractions, and sometimes integers. This deformation is characterized by the fact that after each item in the original series is split into two items, most of the items in the middle cancel each other out.
There are only a few things left. Note: the remainder has the following characteristics: the position of the remainder is symmetrical before and after. The positivity and negativity of other projects are opposite. Error-prone point: Pay attention to check whether the formula after the split item is equal to the original formula. The typical error is:1/(3× 5) =1/3-1/5 (the right side of the equation should be divided by 2). The common methods of sequence summation: formula method, split item elimination method, dislocation subtraction, anti-addition, etc.
2, the sixth grade math questions mainly include:
Fill in the blanks, judge, choose, calculate, draw and apply problems. Among them, the calculation problems include: writing numbers directly, application and simple operation of laws, disjoint operation, and calculation formula based on pictures. In the sixth grade, the mathematical formulas of drawing are basically line graphs. Among these questions, the most important ones are the last two questions: judging questions, looking at line graphs, writing formulas, drawing questions and applying questions. Line drawing is the most important thing to analyze application problems.
In addition to filling in the blanks, selecting and calculating other than charts, the first three questions of application problems are usually relatively simple and belong to sub-topics. There are some places in the fill-in-the-blank question that need to regard brackets as unknowns, which can be determined by column equations. Judgment questions are the most prone to traps, and they are also the most prone to mistakes by students. Some traps are easy to be careless at the moment.
Be deceived. Multiple choice questions can sometimes be excluded by exclusion, and wrong answers can be excluded. The rest are correct answers, and the rest are relatively basic. If you can't even do these things, then other problems can't be solved.