Объяснение:
(8 11/12 - 9 7/12) : 2/9 = -3
8 11/12 - 9 7/12 = 107/12 - 115/12 = - 8/12 = - 2/3
-2/3 : 2/9 = - 2/3 * 9/2 = -3
14 * (1/7)² + 5 5/7 = 6
14 * (1/7)² = 14 * 1/49 = 14/49 = 2/7
2/7 + 5 5/7 = 2/7 + 40/7 = 42/7 = 6
7 / (х+8) = - 1
х + 8 = 7 : (-1)
х + 8 = -7
х = -7 - 8
х = -15
4 / (х-4) = -5
х - 4 = 4 : (-5)
х - 4 = - 0,8
х = - 0,8 + 4
х = 3,2
