Đáp án `+` Giải thích các bước giải:

`{{R_1 nt [R_2 //// (R_3 nt R_4) //// R_5] nt [(R_6 nt R_7) //// R_8]}////[R_{10} nt (R_{11}////R_{12})]} nt R_9`

`R_{34} = R_3 +R_4 = 0,5+1,5) = 2 (Omega)`

`1/R_{2345} = 1/R_2 + 1/R_{34} + 1/R_5 = 1/3 + 1/2 + 1/6 = 1`

`<=> R_{2345} = 1 (Omega)`

`R_{67} = R_6 + R_7 = 3 + 5 = 8 (Omega)`

`R_{678} = (R_{67}R_8)/(R_{67}+R_8) = (8.8)/(8+8) = 4 (Omega)`

`R_{12345678} = R_1 + R_{2345} + R_{678} = 1 + 1 + 4 = 6 (Omega)`

`R_{1112} = (R_{11}R_{12})/(R_{11}+R_{12}) = (6.6)/(6+6) = 3 (Omega)`

`R_{101112} = R_{10} + R_{1112} = 3 + 3 = 6 (Omega)`

`R_x = (R_{12345678}R_{101112})/(R_{12345678}+R_{101112}) = (6.6)/(6+6) = 3 (Omega)`

`R = R_x  + R_9 = 3 + 7 = 10 (Omega)`.