(-1/3-6)(-1/3+8)-(-1/3+4)(10-1/3)=(-19/3)(23/3)-(11/3)(29/3)=(-19/3*23/3)-(11/3*29/3)=(- 437/9)-(319/9)=-756/9=-84
(y^2+2y-4)(7y-2)=7y^3+14y^2-28y-2y^2-4y+8=7y^3+12y^2-32y+8
H=12см,L=13см
R=√(L²-h²)=√(169-144)=√25=5см
V=1/3*πR²h
V=1/3*π*25*12=100πсм³