AB=48/7
令BC=x
BC=AC/3,AC=3x
AB=AC-BC=3x-x=2x
AD=AB/3,AD=2x/3
CD=AD+AB+BC=2x/3+2x+x=11x/3
AM=AC-MC=AC-CD/2=3x-11x/6=7x/6
AM=4
即7x/6=4
x=24/7
AB=2x=48/7
AB=48/7
令BC=x
BC=AC/3,AC=3x
AB=AC-BC=3x-x=2x
AD=AB/3,AD=2x/3
CD=AD+AB+BC=2x/3+2x+x=11x/3
AM=AC-MC=AC-CD/2=3x-11x/6=7x/6
AM=4
即7x/6=4
x=24/7
AB=2x=48/7