Răspuns
7/4+3/10+11/20=(7×5+3×2+11)/20=(35+6+11)/20=52/20=2. 3/5
4/15+7/75+9/25=(4×5+7+9×3)/75=(20+7+27)/75=54/75=18/25
3. 1/2+2. 2/4+2. 15/2+3. 7/10= 7/2+10/4+19/2+37/10=(7×10+10×5+19×10+37×2)/20=(70+50+190+74)/20=384/20=19. 1/5
2. 4/15+2. 5/12+3. 7/10=34/15+29/12+37/10=(34×4+29×5+37×6)/60=(136+145+222)/60=503/60=8. 23/60
3. 1/5- 2. 2/3 -3/25= 16/5-8/3-3/25=(16×15-8×25-3×3)/75=(240-200-9)/75=31/75
2. 1/12- 3/8- 15/16=25/12- 3/8- 15/16=(25×4-3×6-15×3)/48=(100-18-45)/48=37/48
3. 4/25 -1. 4/15-3/5=79/25- 19/15 - 3/5 = (79×3-19×5-3×15)/75=(237-95-45)/75=97/75= 1. 22/75