微观经济学题目,求解答!!已知销售商品x之总收益(R=PQ)方程为:R=100Q...答:0)先求demand curve,P=R/Q=100-4Q等价于Q=25-1/4P,所以dQ/dP=-1/4. MR=dTR/dQ=100-8Q=10,so at MR=10, Q=90/8.from demand curve, P=100-4*90/8=55. elasticity=dQ/dP*P/Q=1.22 1) P=12-0.2Q, MR=12-0.4Q,to max total revenue, set MR=0 to get Q, then...