（60+X）*Y=10X+4Y=（10X+4）/（60+X）X=0,Y=4/60=1/15=0.066666.X=1,Y=14/61=0.229808.X=2,Y=24/62=0.387096.X=3,Y=34/63=0.539682.X=4,Y=44/64=0.6875X=5,Y=54/65=0.830769.X=6,Y=64/66=0.969696.X=7,Y=74/67=1.10...