【jetaineo】評論
法一:(V-16)/4+(V-12)/6+(V-6)/12=0V=13(13-12)/6=1/6 A法二:6//12=4; 4//12=3; 4//6=2.416*1/(4+4)*12/18=4/3 (1)12*1/(6+3)=4/3 (2)6*1/(12+2.4)=1/6 (3)(1)-(2)+(3)=1/6 A