5/9*80%*3/4,
=1/3
3/8*25%+4/8*1/4,
=1/4*(3/8+4/8)
=1/4*7/8
=7/32
48*(11/12-12.5%-1/6),
=48*11/12-48*12.5%-48*1/6
=44-(6+8)
=44-14
=34
7/8-7/8*20%
=7/8*(1-1/5)
=7/8*4/5
=7/10
要采纳最先回答的正确答案,是对答题者劳动的尊重.祝进步!