Răspuns:
Explicație pas cu pas:
4/5+7/8-(1/2-1/4+1/5-1/10)=
=4/5+7/8-(10/20-5/20+4/20-2/20)=
=4/5+7/8-(5/20+2/20)=
=4/5+7/8-7/20=
=32/40+35-14/40=
=67/40-14/40=
=53/40
