2^(-5)×2^9÷2^(-4) = (-2×-2×-2×-2×-2)×(2×2×2×2×2×2×2×2×2)÷(-2×-2×-2×-2)=-32×512÷-16=2х512=1024
Ответ: 1024
2-1 11/35=1 35/35-1 11/35=24/35
24/35:9/25=24/35*25/9=40/21=1 19/21
1 13/14-1 19/21+4/21=1 39/42-1 38/42+8/42=9/42=3/14
- 3 1/7 * (-8) - 2,9 : 0,1 + 11/21 : (-3 2/3) = - 4
1) - 3 1/7 * (-8) = 22/7 * 8 = 176/7 = 25 1/7
2) 2,9 : 0,1 = 29
3) 11/21 : (-3 2/3) = 11/21 : (-11/3) = 11/21 * (-3/11) = - 3/21 = - 1/7
4) 25 1/7 - 29 = - 3 6/7
5) - 3 6/7 + (-1/7) = - 3 6/7 - 1/7 = - 3 7/7 = - 4
Пояснения:
3 целых 1/7 = (3*7+1)/7 = 22/7
(-) * (-) = (+)
3 целых 2/3 = (3*3+2)/3 = 11/3
3/21 = 1/7 - сократили на 3
(+) : (-) = (-)