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在代数式化简中常用公式(?)=|a|,逆用它解题正是该公式双重性的体现,可克服定势思维,提高灵活应变能力,缩短解题长度.
The formula (?)=|a| is commonly used in algebraic Simplification. Solving the problem inversely is the embodiment of the duality of the formula, which can overcome the fixed-thinking, increase the flexibility of adaptability, and shorten the length of the problem.