A cura di: Alfredo Bochicchio

$[(3ab)^3-(-5ab)^2xxab-(2+ab)^7:(8a^2b^2)^2]:(-3/4a^3b^2)^3$
$[27a^3b^3-25a^3b^3-2a^3b^3]:(-27/64a^9b^6)$
$0:(-27/64a^9b^6)$
$0$