A.if 50≤X≤200then y=1000 B.if x<=200andx>=50then y=1000 C.if x<=200orx>=50then y=1000 D.if x>=50,x<=200then y=1000
A.9 B.11 C.1 D.3
A.Val() B.Str() C.Asc() D.Chr()