() . ( , ), . () , , :
TSC = TPC + TEC,
TSC ,
TPC ,
TEC .
(), () (SC) , , : MPC = ∆PC/∆Q, MEC = ∆C/∆Q, MSC = ∆SC/∆Q
MSC = MPC + MEC
() , . , . () , , , , .
TS = TP + TE,
TS ,
TP ,
TE .
, (), () (S) , , : MP = ∆P/∆Q, ME = ∆/∆Q, MSC = ∆S/∆Q
MS = MP + ME
() , . , . ( ) . , . , , ( ).
( ) . , . , , .
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MSC = MS
MPC + MEC = MP + ME
ME = 0, .. MP = MS,
MPC + MEC = MS
MEC = 0, .. MSC = MPC
MSC = MP + ME
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.
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