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在有些含有绝对值的问题中,利用公式 |a|2=a2,可以去掉绝对值的符号或将原问题变形为我们易于解决的问题,这样就可以减少讨论的麻烦,使问题轻松获解．请看一些例子．
In some problems with absolute values, using the formula |a|2=a2, you can remove the sign of the absolute value or deform the original problem into a problem that we can easily solve. This reduces the hassle of the discussion and makes it easier to solve the problem. Please see some examples.