Respostas

2013-09-24T14:20:25-03:00
E=(dq/dp)*p/q
E=d(300-10p)/dp*p/300-10p
Por derivada temos,
E=(0-10)*p/300-10p
E=-10p/300-10p
Substituindo:
E=-10*20/300-10*20
E=-200/100
E=-2
Letra D
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