a) (2.9 + x) - 3.5 = 4.7
2.9 + x - 3.5 = 4.7x - 0.6 = 4.7x = 4.7 + 0.6x = 5.3
Ответ: x = 5.3
б) 13.2 - (5.7 + x) = 3.9
13.2 - 5.7 - x = 3.97.5 - x = 3.9-x = 3.9 - 7.5-x = -3.6x = 3.6
Ответ: x = 3.6
a) (2.9 + x) - 3.5 = 4.7
2.9 + x - 3.5 = 4.7
x - 0.6 = 4.7
x = 4.7 + 0.6
x = 5.3
Ответ: x = 5.3
б) 13.2 - (5.7 + x) = 3.9
13.2 - 5.7 - x = 3.9
7.5 - x = 3.9
-x = 3.9 - 7.5
-x = -3.6
x = 3.6
Ответ: x = 3.6