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因式分解是一种重要的恒等变形.对于有些数字计算题,如果能够巧妙、灵活地运用因式分解进行计算,可化难为易、化繁为简,从而简便、快捷地得到答案.请看下面几例.
Factorization is an important constant deformation. For some numerical calculation problems, if you can use the factorization decomposition skillfully and flexibly, you can get the answer easily and quickly. See the following examples.