i是虚数单位,i=根号下（-1）.本身-1不能开根号,但是将实数域扩展后负数也可以进行开根号运算.运算法则与根号运算一样,例如根号下-3就是 （根号下3）* i；根号下-9就是3i.
以前学过的知识都忘了1.one of the solutions to the equation x^2+20=-4x
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