Реши уровнения 9+x=12.x+4=12,12+x=6,x+7=5.
1) 9 + x = 12 x = 12 - 9 x = 3 2) x + 4 = 12 x = 12 - 4 x = 8 3) x + 7 = 5 x = 5 - 7 x = -2
9+x=12 x=12-9 x=3 x+4=12 x=12-4 x=8