A cura di: Alfredo Bochicchio

$[3/4ab^3xx(-1/9a^2b^2)-(-3/2a^2b^3)^2:(+9/8ab)+2a^3b^5]:(-1/6a^2b^2)$
$[-1/12a^3b^5-(9/4a^4b^6):(9/8ab)+2a^4b^5]:(-1/6a^2b^2)$
$[-1/12a^3b^-2a^3b^5+2a^3b^5]:(-1/6a^2b^2)$
$[-1/12a^3b^]:(-1/6a^2b^2)$
$+1/2ab^3$