解令x+y/2=z+x/3=y+z/4=t即x+y=2tz+x=3ty+z=4t三式联立解得x=0.5t，y=1.5t，z=2.5t把x=0.5t，y=1.5t，z=2.5t代入x+y+z=27即0.5t+1.5t+2.5t=27即4.5t=27解得t=6故x=0.5×6=3y=1.5×6=9z=2.5×6=15
