Вычислите: 3/5+3/7+9/7*4/15 (7/9-1/6): 2/9 *21/22

3/5+3/7+9/7*4/15=1 целая 13/35

1) 9/7*4/15=9*4/7*15=3*4/7*5=12/35
1) 3/5+3/7=3*7/35+3*5/35=21/35+15/3=36/35
2) 36/35+12/35=48/35=1 13/35

(7/9-1/6):2/9 *21/22=2 целых 5/8
1) 7/9-1/6=7*2/18-1*3/18=14/18-3/18=11/18
2) 11/18:2/9=11*9/18*2=11*1/2*2=11/4
3)11/4*21/22=11*21/4*22=1*21/4*2=21/8=2 5/8

1) 3/5+3/7+9/7*4/15 = 3/5+3/7+12/35 = 42/70 + 30/70 + 24/70 = 96/70 = 48/35
2) (7/9-1/6):2/9*21/22 = (14/18-3/18):7/33 = 11/18:7/33 = 11/18*33/7 = 121/42.