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第一個,電源等效,左側5Ω加5V可形成電流源1A方向向下為正(電源內部,電流從低電勢流向高電勢,所以為:向上為正2A -1A=1A電流源與5Ω電阻並聯,進一步可等效為正5V電壓源與5Ω電阻串聯.所以,開路電壓為uab=5V,短路電流...
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