（1）5分之3÷4分之1÷6÷15分之14
=3/5x1/4x1/6x15/14
=3/5x1/6x1/4x15/14
=1/10x1/4x15/14
=1/40x15/14
=15/560
=3/112
（2）4.25×20分之9-2分之1×0.45+4分之9÷9分之20
=4.25x0.45-0.5x0.45+2.25x0.45
=(4.25-0.5+2.25)x0.45
=6x0.45
=2.7
如果本題有什么不明白可以追問(wèn),
另外發(fā)并點(diǎn)擊我的頭像向我求助,請(qǐng)諒解,請(qǐng)問(wèn)這個(gè)是3/5x1/4。。。。5分之3×4分之1嗎對(duì)但是應(yīng)該分?jǐn)?shù)除分?jǐn)?shù)就應(yīng)該變成分?jǐn)?shù)×另一個(gè)分?jǐn)?shù)的倒數(shù)吧？寫錯(cuò)了（1）5分之3÷4分之1÷6÷15分之14=3/5x4x1/6x15/14=12/5x1/6xx15/14=2/5x15/14=3/7