U1=(3/2)*p1*V1=(3/2)*po*9*Vo
U2=(3/2)*p2*V2=(3/2)*4*po*Vo
ΔU=U1-U2=(3/2)*5*po*Vo
Уменьшилась на 5*po*Vo
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Verified answer
U1=(3/2)*p1*V1=(3/2)*po*9*Vo
U2=(3/2)*p2*V2=(3/2)*4*po*Vo
ΔU=U1-U2=(3/2)*5*po*Vo
Уменьшилась на 5*po*Vo
============================