Răspuns :
ex1: 5/8 ,4/6 ,6/7
ex2:5/8+2/8=5+2/8=7/8 ,7/10+2/10=7+2/10=9/10 ,8/100+9/100=8+9/100=17/100
ex3:4/9+2/9=6/9 ,3/10+4/10=7/10 ,25/100+15/100=40/100
ex2:5/8+2/8=5+2/8=7/8 ,7/10+2/10=7+2/10=9/10 ,8/100+9/100=8+9/100=17/100
ex3:4/9+2/9=6/9 ,3/10+4/10=7/10 ,25/100+15/100=40/100