1 6 11 16 21 26 31
20 17 14 11 9 6 3 1
1 2 3 5 8 10 13 16
Х/8 = 23 * 3
х/8 = 69
х = 69 * 8
х = 552
1)1 9/16 ÷ 3/8 = 25/16 ÷ 3/8 = 25/16 × 8/3 =200/48= 25/6 = 4 1/6
2)4 1/6 - 1/8 = 25/6 - 1/8 =<span> </span><span>(25 × 4 - 1 × 3)/24 = 100/24 - 3/24 = 97/24 = 4 1/24
ответ: 4 1/24</span>
81% от 15 т
81%=0,81
0,81*15=12,15 т муки
8 3/4+1 9/10= 8 15/20 +18/20= 33/20 = 1 13/20