若实数x 、y满足根号下5x-1+绝对值的y+5然后等于0,则根号下xy =
问题描述:
若实数x 、y满足根号下5x-1+绝对值的y+5然后等于0,则根号下xy =
答
因为根号下5x-1和绝对值的y+5都>=0
所以根号下5x-1=0且绝对值的y+5=0
所以x=1/5,y=-5
xy = -1