A cura di: Francesco Speciale

Svolgimento:
$1/4-(-3abc)(-1/9a^2b)+(-1/3)(-9/2)+(1/4a)(-8/3a^2b^2c)=$
$1/4-(1/3a^3b^2c)+3/2-2/3a^3b^2c=$
$1/4-1/3a^3b^2c+3/2-2/3a^3b^2c=-a^3b^2c+(1+6)/4=-a^3b^2c+7/4$.