Решить 13,44: 1 цел 3/5 (4цел 3/7+1цел 2/3)*2,1

   =21/32

1)   13,44 : 1 3/5=13,44 : 1,6=8,4
2)   4 3/7+1 2/3=4 9/21 + 1 14/21=5 23/21=6 2/21
3)   6 2/21 * 2,1=128/21 * 21/10=128/10=12,8
4)   8,4 : 12,8=84/10 : 128/10=84/10 * 10/128=84/128=21/32

1) 13,44 : 1 3/5 = 1344/100 : 8/5 = 1344/100 * 5/8 = 8,4,

2) 4 3/7 + 1 2/3 = 4 9/21 + 1 14/21 = 5 23/21 = 6 2/21,
3) 6 2/21 * 2,1 = 128/21 * 21/10 = 128/10 = 12,8,

4) 8,4 / 12,8 = 21/32