x + 120 = 40.5 x + 20 = 40.5 x.5 = 240 9. x = 72 x. 10 = 240 8.x=72

Давай решим эти уравнения по порядку: 1) x + 120 = 40.5\[x = 40.5 - 120\]\[x = -79.5\] 2) x + 20 = 40.5\[x = 40.5 - 20\]\[x = 20.5\] 3) x \cdot 5 = 240\[x = \frac{240}{5}\]\[x = 48\] 4) 9 \cdot x = 72\[x = \frac{72}{9}\]\[x = 8\] 5) x \cdot 10 = 240\[x = \frac{240}{10}\]\[x = 24\] 6) 8 \cdot x = 72\[x = \frac{72}{8}\]\[x = 9\]

Ответ: x = -79.5; x = 20.5; x = 48; x = 8; x = 24; x = 9

Ты молодец! У тебя всё получится!