55
Х = 55 – 35
Х = 20
20
+ 35 = 55= 79
6 8 = 48
4 9 = 36
37- 15 = 22
55 + 25 = 8
Х – 33 = 54
Х = 54 + 33
Х = 87
87 – 33 = 54
50
86 – 34 = 52
98 – 45 = 53
84 – 24 + 15=75
54 - Х = 33
Х = 54 – 33
Х = 21
54 - 21= 33
4 + 6 = 90
72-70 + 20 = 22