(5分之2＋4分之3)×60
=2/5×60+3/4×60
=24+45
=69
4分之3×5分之9＋4分之1×5分之9
=（3/4+1/4）×9/5
=1×9/5
=9/5
14分之3×13＋14分之3
=（13+1）×13/14
=14×13/14
=13
54×55分之54
=（55-1）×54/55
=54-54/55
=54又1/55
用简便方法计算.谢谢,要过程,有些麻烦你打,答得好的我马上采纳. 急!
(5分之2＋4分之3)×60
=2/5×60+3/4×60
=24+45
=69
4分之3×5分之9＋4分之1×5分之9
=（3/4+1/4）×9/5
=1×9/5
=9/5
14分之3×13＋14分之3
=（13+1）×13/14
=14×13/14
=13
54×55分之54
=（55-1）×54/55
=54-54/55
=54又1/55