>>38訂正
1=010  0=000

(0/1)x(1/0)=0x1=0 ↓

  0   x  1 =  0 x 1=0
(000/010)x(010/000)=000x010=000

(0/1)x(1/0)=((0x0)+(1x1))/(1x0)=(0+1)/1=1 ↓

     0     =     1       / 1   =    1   =1
  0  x   1 = 0 x 0+ 1 x 1 / 1x0  = 0+1 / 1 =1   
(000/010)x(010/000)=((000x000)+(010x010))/(010x000)=(000+010)/010=010

即ち 0x1=0