tolong dong kaa di jawab

R9 + R10 = 2 + 4 = 6 ohm
R8 + 6 = 1/3 + 1/6 = 2/6 + 1/6 = 3/6
(dibalik) 6/3 = 2 ohm

R3 + R4 = 3 + 1 = 4 ohm
R5 + 4 = 1/4 + 1/4 = 2/4 (dibalik) 4/2 = 2 ohm

R7 +R11 + 2 = 7 + 1 + 2 = 10 ohm

R2 + R6 + 2 = 5 + 3 + 2 = 10 ohm

then, 1/10 + 1/10 = 2/20 (dibalik juga) 20/2 = 10 ohm

the last one, R1 + R12 + 10 = 6 + 2 + 10 = 18 ohm

jadi Rs nya 18 ohm

maaf kalo ada yg salah