Начинать надо с последних элементов.
Использовать формулу для двух параллельных резисторов:
Ra,b = (Ra*Rb)/(Ra+ Rb).
R6,7 = (10*13)/(10 + 13) = (130/23) Ом.
R5-7 = 16 + (130/23) = (298/23) Ом.
R3,4 = 10 + 16 = 26 Ом.
R3-7 = (26*(498/23)/(26 + (498/23) = (12948/1096) Ом.
R2-7 = 25 + (12948/1096) = (40348/1096) Ом.
R1-7 = (25*(40348/1096))/(25 + (40348/1096)) = 1008700
/67748 = (252175/16937) Ом.
R1-7 ≈ 14,88900041 Ом.
Iобщ = (60*16937)/252175 ≈ 4,02982 А.
I1 = 60/25 = 2,4 A.
I2 = Iобщ - I1 = 4,02982 - 2.4 = 1,62982 A.
U2 = I2*R2 = 1,62982*25 = 40,7455 B.
U3-7 = 60 - U2 = 60 - 40,7455 = 19,2545 B.
I3 = I4 = U3-7/R3,4 = 19,2545/26 = 0,7406 A.
I5 = U3-7/R5-7 = 19,2545/(298/23) = 0,8892 A.
U6-7 = U3-7 - I5*R5 = 5,0263 B.
I6 = 5,0263/10 = 0,5026 A.
I7 = 5,0263/13 = 0,3866 A.
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Verified answer
Начинать надо с последних элементов.
Использовать формулу для двух параллельных резисторов:
Ra,b = (Ra*Rb)/(Ra+ Rb).
R6,7 = (10*13)/(10 + 13) = (130/23) Ом.
R5-7 = 16 + (130/23) = (298/23) Ом.
R3,4 = 10 + 16 = 26 Ом.
R3-7 = (26*(498/23)/(26 + (498/23) = (12948/1096) Ом.
R2-7 = 25 + (12948/1096) = (40348/1096) Ом.
R1-7 = (25*(40348/1096))/(25 + (40348/1096)) = 1008700
/67748 = (252175/16937) Ом.
R1-7 ≈ 14,88900041 Ом.
Iобщ = (60*16937)/252175 ≈ 4,02982 А.
I1 = 60/25 = 2,4 A.
I2 = Iобщ - I1 = 4,02982 - 2.4 = 1,62982 A.
U2 = I2*R2 = 1,62982*25 = 40,7455 B.
U3-7 = 60 - U2 = 60 - 40,7455 = 19,2545 B.
I3 = I4 = U3-7/R3,4 = 19,2545/26 = 0,7406 A.
I5 = U3-7/R5-7 = 19,2545/(298/23) = 0,8892 A.
U6-7 = U3-7 - I5*R5 = 5,0263 B.
I6 = 5,0263/10 = 0,5026 A.
I7 = 5,0263/13 = 0,3866 A.