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解数学题时,一般先经过思考、联想,然后以数学概念、定理为依据,用筛选出的方法、公式为钥匙,迅速打开解题大门. 要想尽快进入“门”内,必须注意开“门”的方法.本文就“以退求进”法谈点管见. 由果退因 解数学题时,可从已知推到结论,也可执果索因,分析“长果”所需条件,若具备了条件且每步可逆,则顺“流”而下,势
When solving a mathematics problem, it is generally thought and associative, and then based on mathematical concepts and theorems, using the selected methods and formulae as keys, the problem-solving door can be quickly opened. If you want to enter the “gate” as soon as possible, you must pay attention to open it. The method of “door”. This article talks about the “retreat from progress” method. When Guo Tui solves a math problem, it can be pushed from the known to the conclusion, and it can also be used to analyze the required factors of “long fruit”. If the conditions are met and each step is reversible, then the “stream” will flow down.