Question

Решите плиз !!!
/ это дробь
4/5 + 3/7=
5/12 + 9/20=
5/18 + 4/45=
12/17 + 27/34=

Answer 1

4/5+3/7=20/35+15/35=35/35=1
5/12+9/20=25/60+27/60=52/60=13/15
5/18+4/45=25/90+8/90=35/90=7/18
12/17+27/34=24/34+27/34=51/34=1 17/34=1 1/2

Answer 2

4/5+3/7=28/35+15/35=43/35 5/12+9/20=25/60+27/60=52/60=13/15 5/18+4/45=25/90+8/90=33/90=11/30 12/17+27/34=24/34+27/34=51/34=3/2