Question

помогите прошу номер 521 522 прошуу

Answer 1

N521
1/3+4/5-1/12=17/15-1/12=43/60
1/3=5/15, 4/5=12/15; 12/15=48/60 1/12=5/60;

2/7-1/6+1/9= 5/42+1/9=29/126
2/7=12/42 1/6=7/42 5/42=15/126 1/9=14/126