(1.2+2.5-7/25)÷7/25=(6/5+5/2-7/25)*25/7=[(60+125-14)/50]*25/7=171/50*25/7=171/14
(1.2+2.5-7/25)÷7/25=(1.2+2.5-0.28)×25/7=(3.7-0.28)×25/7=3.42×25/7=85.5/7=855/70=171/14