<span>¥ это валюта Японии
</span><span>0,25•¥128 = </span>32<span>¥
</span>
2 3/4=11/4
11/4: 11= 1/4=0,25
81/88 * (6 - 1 13/15 * 1 19/21) = 2 целых 1/4
1) 1 13/15 * 1 19/21 = 28/15 * 40/21 = (4*8)/(3*3) = 32/9
2) 6 - 32/9 = 54/9 - 32/9 = 22/9
3) 81/88 * 22/9 = (9*2)/(8*1) = 18/8 = 2 2/8 = 2 1/4
18/2=9
18/3=6
18/6=3
18/9=2
36/2=18
36/3=12
36/6=6
36/9=4