Question

А) 9/17 + 21/34 б) -9/17 - 21/34 в) 9/17 - 21/34 г)-9/17 + 21/24

Answer 1

А) 0,529+061=1,139
б) -0,529,-0,61=-1,139
в) 0,529-0,61=-0,081
г) -0,529+0,61=0,081

Answer 2

а) 9/17 + 21/34 = (9*2 + 21)/34 = (18 + 21)/34 = 39/34

б) -9/17 - 21/34 = (-9*2 - 21)/34 = (-18 - 21)/34 = -39/34

в) 9/17 - 21/34 = (9*2 - 21)/34 = (18 - 21)/34 = -3/34

г) -9/17 + 21/24 = (-9*24 + 17*21)/(17*24) = (-216 + 357)/408 = 141/408 = 47/136