11 Реши уравнения с комментированием и сделай проверку: a) (300 x 72): 7 = 96 + 108 6) 200 - 560 : (y + 36) = 48.4

a) (300 ⋅ x – 72) ∶ 7 = 96 + 108

(300 ⋅ x – 72) ∶ 7 = 204

300 ⋅ x – 72 = 204 ⋅ 7

300 ⋅ x – 72 = 1428

300 ⋅ x = 1428 + 72

300 ⋅ x = 1500

x = 1500 ∶ 300

x = 5

Проверка:

(300 ⋅ 5 – 72) ∶ 7 = 96 + 108

(1500 – 72) ∶ 7 = 204

1428 ∶ 7 = 204

204 = 204

б) 200 – 560 ∶ (y + 36) = 48 ⋅ 4

200 – 560 ∶ (y + 36) = 192

560 ∶ (y + 36) = 200 – 192

560 ∶ (y + 36) = 8

y + 36 = 560 ∶ 8

y + 36 = 70

y = 70 – 36

y = 34

Проверка:

200 – 560 ∶ (34 + 36) = 48 ⋅ 4

200 – 560 ∶ 70 = 192

200 – 8 = 192

192 = 192

Ответ: а) x = 5, б) y = 34