Вложение ..................................................................
4 1/7 + 3 2/3 = 4 3/21 + 3 14/21 = 7 17/21
7 17/21 : 16/21 = 119/16
18,5 - 119/16 = 18 1/2 - 7 7/16 = 18 8/16 - 7 7/16 = 11 1/16
Ответ: 11 1/16
21а³в²/63а⁵в=1/3*1/а²*в/а=в/3а²
21/63=1/3
а³/а⁵=1/а²
в²/в=в/1
1) 7*8=56
2) 2400:30= 80
3) 5600: 56=100
4) 72043-70928=1115
5) 1115+80=1195
6) 1195-100=1095