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定理︱︱a︱-︱b︱︱≤︱a±b︱≤︱a︱+︱b︱在形式上很简单,但在实际处理一些问题时能收到一些意想不到的效果,因而常常利用此不等式进行放缩,证明有关
Theorem ︱ ︱ a ︱-︱ b ︱ ︱ ︱ ︱ ︱ ︱ ︱ ︱ ︱ ︱ ︱ ︱ ︱ ︱ formally very simple, but in actual treatment of some problems can receive some unexpected results, which are often used Inequalities scaling, to prove relevant