24/5*11/8 + (61/10)/(8/5) + 13/10*11/8 【通分】= (24*11*2)/80 + (61*5)/80 + (13*11)/80【提取公因式11】= 11(48+13)/80 + (61*5)/80 = 11*61/80 + (61*5)/80【提取公因式61】= 61(11+5)/80= 61*16/80【约...