Calculati:(5/7+55/77+555/777):5/7-111/500:(1/5+1/50+1/500).

Răspuns :

5/7 · (1+11+111) · 7/5 - 111/500 : [1/5(1+1/10+1/100)]=
=123 - 111/500 ·5/1 :(100+10+1)/100=
=123 - 111/100 · 100/111=
=123 -1= 122
(5/7+5/7+5/7)*7/5-111/500:111/500=5+5+5 totu pe 7*7/5-111/500:111/500=15/7*7/5-1=3-1=2