1) 12-7 = 5 + Х + 4 = 15 + Х + 4 = 1Х + 9 = 1Х = 3
2) 27-1 = 226 - 5 + Х - 6 = 220 + Х - 6 = 2Х - 6 = Х = 6
1) 12-7 =
5 + Х + 4 = 1
5 + Х + 4 = 1
Х + 9 = 1
Х = 3
2) 27-1 = 2
26 - 5 + Х - 6 = 2
20 + Х - 6 = 2
Х - 6 =
Х = 6