ther is a problem in the following xslt1.0 transformation
it dose not return the 1/3*( ...)  and  2/3*(....) operation

<x><xsl:value-of select="(1 div 3 *
(current()/preceding-sibling::*[1]/child::x[position()=last()])) + (2 div
3  * (x[1]))"/></x>

any help please