Răspuns :
5/ rad 5 - 3/ rad 4 + 7/10 =
= 5*rad 5/5 - 3/2 + 7/10 =
= rad 5 - 15/10 + 7/10 =
= rad 5 - 8/10 =
= rad 5 - 4/5
= 5*rad 5/5 - 3/2 + 7/10 =
= rad 5 - 15/10 + 7/10 =
= rad 5 - 8/10 =
= rad 5 - 4/5