亲,还满意吧?给个采纳吧,谢谢!
看
±2√91的平方等于364(±2√91)²=4x91=364
364=4X91,(土2V91)^2=364,所以是土2V91 请采纳
364=4X91,(土2V91)^2=364,所以是土2V91