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(5/7+55/77+555/777):5/7-111/500:(1/5+1/50+1/5000)

Răspuns :

(5/7+55/77+555/777):5/7-111/500:(1/5+1/50+1/500)=
=(5/7+5/7+5/7):5/7-111/500:(100+10+1)/500=
=15/7 × 7/5 -111/500: 111/500=
= 3 -111/500 × 500/111=
= 3 -1= 2