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一个数学公式,要准确无误地记住,总是需要下一番功夫的。死记硬背,往往事倍功半。没有深刻理解的东西,日久天长,就会回生、遗忘;理解了的知识,才能牢固记忆。理解记忆主要凭借逻辑思维,但在有些情况下,形象思维不无补益。就拿两数和的立方公式(α+b)~3=α~3+3α~2b+3αb~2+b~3来说吧。一般是用代数的多项式乘法展开(α+b)~3,再通过合并同类项得出公式。这
A mathematical formula, to accurately remember, always need some effort. Rote, often less effective. Without profound understanding of things, over time, will be back to life, forgotten; understanding of knowledge, to firmly remember. Understanding memory mainly by virtue of logical thinking, but in some cases, the image of thinking is not without benefits. Take the two-sum cubic formula (α + b) ~ 3 = α ~ 3 + 3α ~ 2b + 3αb ~ 2 + b ~ 3 for example. Generally, the algebraic polynomial multiplication is used to expand (α + b) ~ 3, and the formula is derived by combining the same terms. This