ответ: 23 207/400.
1) 5 1/4 × 8/15 = 21/4 × 8/15 = 2 4/5;
2) 9 9/25 : 12/25 = 19 1/2;
3) 3/4 × 1 1/4 = 15/16;
4) 7/6 : 4 1/6 = 7/25;
5) 2 4/5 + 19 1/2 = 22 3/10;
6) 22 3/10 + 15/16 = 23 19/80;
7) 23 19/80 + 7/25 = 23 207/400.
ответ: 23 207/400.
1) 5 1/4 × 8/15 = 21/4 × 8/15 = 2 4/5;
2) 9 9/25 : 12/25 = 19 1/2;
3) 3/4 × 1 1/4 = 15/16;
4) 7/6 : 4 1/6 = 7/25;
5) 2 4/5 + 19 1/2 = 22 3/10;
6) 22 3/10 + 15/16 = 23 19/80;
7) 23 19/80 + 7/25 = 23 207/400.