Question

y=t+1/t+1的值域怎么求.要过程要过程要过程要过程要过程要过程要过程要过程要过程要过程要过程要过程要过程要过程要过

Answer 1

当t>0时

则1/t>0

y=t+1/t+1

>=2√t*1/t +1 =2+1=3

当t=2√(-t)*(1/(-t))-1 =2-1=1

y