1)
-a³+b³= -(a³-b³)= -(a-b)(a²+ab+b²)
2)
-a^6+1/8= -[(a²)³-(1/2)³] = - (a²-1/2)(a^4+1/2a²+1/4)
S/16-S/24=2 s=96
S/24=4
S/16=6
V=96*2/(10)=19,2