1.а) 5/16
б) 12/7 × 49/8 = 21/2 = 10,5
в) 18
2. 18 × 4/9 = 8 кг
3. 33/14 × 28/11 - 9/25 × 5/3 = 6 - 3/5 = 27/5 = 5 2/5
4. 1) 16/3 × 15/2 = 40 (см) - длина
2) 40 × 0,3 = 12 (см) - высота
3) V=авс= 16/3 × 40 × 12 = 64×40 = 2560 (см^3)
5. 3/4 × 16/15 + 16/15 × 5/2 - 11/8 × 16/15 = 16/15 × (3/4 + 5/2 - 11/8) = 16/15 × (6+20+11)/8 = 16/15 × 37/8 = 74/15 = 4 14/15