Question

已知xy是实数 且y=根号x-1+根号1-x+0.5,化简(1-y)/(y-1)

Answer 1

根据根号下为非负数得

x-1≥0 1-x≥0

x≥1 x≤1

所以x=1

y=0+0+0.5=0.5

于是

(1-y)/(y-1)

=(1-0.5)/(0.5-1)

=0.5/(-0.5)

=-1