15-30又1/4/2又1/5+1又5/21*8又3/5

来源：学生学帮网编辑：学帮网时间：2024/06/07 03:47:33

15-30又1/4/2又1/5+1又5/21*8又3/5
=15-121/4*5/11+26/21*43/5
=15-55/4+1118/105
=5/4+1118/105
=4997/420
=11又377/420