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Xem thêm: Solution manual fundamentals of electric circuits 3rd edition chapter04, Let i = i1 + i2 + i3, where i1 , i2 , and i3 are due to the 20-V, 2-A, and 16-V sources. For i1, consider the circuit below., RTh = (10 + 20)||(50 + 40) 30||90 = 22.5 ohms