Răspuns:

198

Explicație pas cu pas:

xyz=xy+ yz+zx

100x+10y+z=10x+y+10y+z+10z+x

100x+10y+z=11x+11y+11z

100x-11x+10y-11y+z-11z=0

89x-y-10z=0

89x=10z+y

observam ca x=1, y=9, z=8 convin

89*1=10*8+9*1

89=80+9, adev.