抱歉我找到了自己回覆一下https://play.google.com/store/apps/details?id=uk.co.nickfines.RealCalc&feature=search_result#?t=W251bGwsMSwxLDEsInVrLmNvLm5pY2tmaW5lcy5SZWFsQ2FsYyJd原來2nd F就是SHIFT