Реши уравнения с комментированием и сделай проверку: a) a ⋅ 948 – 6390 = 429 690 б) 273 996: b + 15 764 = 16 151 в) (50 – x) : 7 + 195 = 40 ⋅ 5

а)

• a ⋅ 948 – 6390 = 429 690
• a ⋅ 948 = 429 690 + 6390
• a ⋅ 948 = 436 080
• a = 436 080 : 948
• a = 460

Проверка:

• 460 ⋅ 948 – 6390 = 429 690
• 436 080 – 6390 = 429 690
• 429 690 = 429 690

Ответ: a = 460

б)

• 273 996 : b + 15 764 = 16 151
• 273 996 : b = 16 151 – 15 764
• 273 996 : b = 387
• b = 273 996 : 387
• b = 708

Проверка:

• 273 996 : 708 + 15 764 = 16 151
• 387 + 15 764 = 16 151
• 16 151 = 16 151

Ответ: b = 708

в)

• (50 – x) : 7 + 195 = 40 ⋅ 5
• (50 – x) : 7 + 195 = 200
• (50 – x) : 7 = 200 – 195
• (50 – x) : 7 = 5
• 50 – x = 5 ⋅ 7
• 50 – x = 35
• x = 50 – 35
• x = 15

Проверка:

• (50 – 15) : 7 + 195 = 40 ⋅ 5
• 35 : 7 + 195 = 200
• 5 + 195 = 200
• 200 = 200

Ответ: x = 15