看看::

CLEAR
DEMINSION X(5)
FOR I=1 TO 5
INPUT " 请输入任意数: " TO X(I)
ENDFOR
MIN=X(1)
FOR I=2 TO 5
IF X(I)<MIN
MIN=X(I)
ENDIF
ENDFOR
? "最小数为: " ,MIN

哦!!
我太糊涂了..问题解决了.
看来书要泡透.
thang you!