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calculati: a) (7/16+17/5-1/40)-(5/8-3/5)

Răspuns :

(7/16+17/5-1/40)-(5/8-3/5)=
=7/16+17/5-1/40-(25/40-24/40)=
=7/16+17/5-1/40-(25-24)/40=
=7/16+17/5-1/40-1/40=
=(5*7)/80+(16*17)/80-2/80-2/80=
=35/80+272/80-2/80-2/80=
=(35+272-2-2)/80=
=(3007-4)/80=
=303/80