E为弹性,E=-(P/Q)*(dQ/dP)=5P/Q.
R=Q*P=(100-5P)*P=100P-5P^2
左边=dR/dP=R'=100-10P
右边=Q(1-E)=(100-5P)*(1-5P/Q)=100-5P-500P/Q+25P^2/Q
=((100-5P)*Q-500P+25P^2)/Q)=((100-5P)^2-500P+25P^2)/(100-5P)
=(10000-1500P+50P^2)/(100-5P)=(2000-300P+10P^2)/(20-P)
=100-10P
所以,左边=右边
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