【4-（5分之3-3又3分之1）】÷4分之15
=【4+2又11/15】÷15/4
=101/15×4/15
=404/225
160.6×2又4分之3-0.6÷11分之4
=160.6×11/4-0.6×11/4
=（160.6-0.6）×11/4
=160×11/4
=440
2.42÷3分之4+4.58×4分之3+3÷4
=2.42×3/4+4.58×3/4+3/4
=（2.42+4.58+1）×3/4
=8×3/4
=6