one and a half apples/apple is/are one the table.

1.apples
2.is
one and a half +名词的复数可以表示一个半名词.例如：one and a half apples意思是：一个半苹果,注意名词必须要用复数.
当“One and a half+复数名词”做主语时,谓语动词采用单数形式.例:One and a half bananas is left on the table.桌子上还有一个半香蕉.