Răspuns :
7/10+3/100+5/1000=700/1000+30/1000+5/1000=735/1000.......2)15/75+35/25+24/40=60/300+420/300+180/300=660/300=66/30.......3)7/10+5/100+3/20=70/100+5/100+15/100=90/100=9/10.....................Calculeaza diferentele:77/12-35/36.........numitorul comun fiind 36,amplificam prima fractie3...si rezulta:231/36-35/36=196/36B)..numitorul comun e 45...amplificam prima fractie cu 3...ai acum avem:969/45-124/45=845/45.....