Question

найди неизвестное
б)26.9 - ? = 104
  ? + 480 : 8 = 570
  68 : 4 + ? = 158
  ? - 7 .18 = 57

Answer 1

26.9 - х = 104
26.9 - 104 = х
х=-77.1

х + 480 : 8 = 570
х + 60 = 570 
х = 570 - 60
х = 510

68 : 4 + х = 158
17 + х = 158
х = 158 - 17
х = 141

х - 7.18 = 57
х = 57 + 7.18
х = 64.18 

Answer 2

26.9 - х = 10.4
29.9 - 10.4 = х
х= 19.5

х + 480 : 8 = 570
х + 60 = 570
х = 570 - 60
х = 510

68 : 4 + х = 158
17 + х = 158
х = 158 - 17
х = 141

х - 7.18 = 57
х = 57 + 7.18
х = 64.18

Answer 3

26.9 - ( - 77,1)= 104
510 + 480 : 8 = 570
68 : 4 + 141 = 158
64,18 - 7 .18 = 57

Answer 4

26.9 - ( - 77,1)= 104
510 + 480 : 8 = 570
68 : 4 + 141 = 158
64,18 - 7 .18 = 57