15-30又1/4/2又1/5+1又5/21*8又3/5
问题描述:
15-30又1/4/2又1/5+1又5/21*8又3/5
答
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