小明郵票張數(shù)的3/4和小華的4/5相等,小明的郵票張數(shù)是小華的十六分之十五(15/16)
3/4=4/5
通分后就可看清楚
15/20=16/20
即15/16
（1+1/2+1/3+1/4）×（1/2+1/3+1/4+1/5）-（1+1/2+1/3+1/4+1/5）×（1/2+1/3+1/4）
=1×(1/2+1/3+1/4+1/5)+(1/2+1/3+1/4)×(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/5)×(1/2+1/3+1/4)
=(1/2+1/3+1/4+1/5)+(1/2+1/3+1/4)×[(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/5)]
=(1/2+1/3+1/4+1/5)+(1/2+1/3+1/4)×[-1]
=(1/2+1/3+1/4+1/5)-(1/2+1/3+1/4)
=1/5
4x-1/6=8/3
4x=1/6+8/3
4x=17/6
x=17/24