20又1/5-7/25/10又3/8+15又9/16
问题描述:
20又1/5-7/25/10又3/8+15又9/16
答
(20又1/5-7/25)/(10又3/8+15又9/16)
=(101/5-7/25)/(83/8+249/16)
=(498/25)/(415/16)
=498*16/25*415
=7968/10375