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平方差公式:(a+b)(a-b)=a2-b2,是初一代数的一个重要公式,在解题中若能灵活地运用这一公式,常常使问题化难为易,化繁为简,收到事半功倍之效。
The square difference formula: (a+b)(ab)=a2-b2 is an important formula of the first generation number. If the formula can be flexibly used in the problem solving, it often makes the problem-solving difficult and easy. , receive more with less effort.