[填空题]
Calculate the terminfve:2:s;pk ch/io1 og z9*ue /hifjy 5tr7+wpal voltage for a battery with an internal resistance of $0.900\Omega$ and an emf of $8.50\,V$ when the battery is connected in series with
(a) an $81.0-\Omega$ resistor, V
(b) an $810-\Omega$ resistor. V