a) (2.9 + x) - 3.5 = 4.7
2.9 + x - 3.5 = 4.x - 0.6 = 4.x = 4.7 + 0.x = 5.3
Ответ: x = 5.3
б) 13.2 - (5.7 + x) = 3.9
13.2 - 5.7 - x = 3.7.5 - x = 3.-x = 3.9 - 7.-x = -3.x = 3.6
Ответ: x = 3.6
a) (2.9 + x) - 3.5 = 4.7
2.9 + x - 3.5 = 4.
x - 0.6 = 4.
x = 4.7 + 0.
x = 5.3
Ответ: x = 5.3
б) 13.2 - (5.7 + x) = 3.9
13.2 - 5.7 - x = 3.
7.5 - x = 3.
-x = 3.9 - 7.
-x = -3.
x = 3.6
Ответ: x = 3.6