187
punti
Livello 1
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$(a+3)(a-2)(a-1)-(a+6)(a^2-3a-4)-3a(5-a)=$
$= (a^2-2a+3a-6)(a-1)-(a^3-3a^2-4a+6a^2-18a-24)-15a+3a^2=$
$= (a^2+a-6)(a-1)-(a^3+3a^2-22a-24)-15a+3a^2=$
$= \cancel{a^3}-\cancel{a^2}+\cancel{a^2}-a-6a+6-\cancel{a^3}-\cancel{3a^2}+22a+24-15a+\cancel{3a^2}=$
$= (-1-6+22-15)a +30=$
$= 0a+30=$
$=30$
60153
punti
Genius I