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适当构造复数,进而利用模的性质,常可巧妙简捷地求解多元函数最值.为叙述方便,首先介绍复数模几个常见性质:
Constructing complex numbers appropriately, and then using the properties of the module, can often solve the best value of the multivariate function skillfully and simply. For the convenience of narrative, first introduce several common properties of the complex modulus: