Контрольные задания > 105. Используя уравнения: a) 297 < 312 x · 173 = 865, x = ? x - 1038 = 155, x = ? 9843 - x = 1193, x = ? 173 · x = 98 437, x = ? б) 309 · x = 228 042, x = ? x - 2163 = 117, x = ? 1 174 - x = 247, x = ? 309 · x = 2 472, x = ? в) x · 964 = 6748, x = ? 964 · x = 1928, x = ? x : 272 = 964, x = ? 6940 - x = 6748, x = ? г) x · 789 = 3 156, x = ? 3211 - x = 55, x = ? x : 407 = 789, x = ? 789 · x = 5523, x = ?
Вопрос:

105. Используя уравнения: a) 297 < 312 x · 173 = 865, x = ? x - 1038 = 155, x = ? 9843 - x = 1193, x = ? 173 · x = 98 437, x = ? б) 309 · x = 228 042, x = ? x - 2163 = 117, x = ? 1 174 - x = 247, x = ? 309 · x = 2 472, x = ? в) x · 964 = 6748, x = ? 964 · x = 1928, x = ? x : 272 = 964, x = ? 6940 - x = 6748, x = ? г) x · 789 = 3 156, x = ? 3211 - x = 55, x = ? x : 407 = 789, x = ? 789 · x = 5523, x = ?

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Ответ:

Решение:

а)

  • x · 173 = 865 => x = 865 / 173 ≈ 5
  • x - 1038 = 155 => x = 155 + 1038 = 1193
  • 9843 - x = 1193 => x = 9843 - 1193 = 8650
  • 173 · x = 98 437 => x = 98437 / 173 = 570.73... ≈ 571

б)

  • 309 · x = 228042 => x = 228042 / 309 = 738
  • x - 2163 = 117 => x = 117 + 2163 = 2280
  • 1174 - x = 247 => x = 1174 - 247 = 927
  • 309 · x = 2472 => x = 2472 / 309 = 8

в)

  • x · 964 = 6748 => x = 6748 / 964 = 7
  • 964 · x = 1928 => x = 1928 / 964 = 2
  • x : 272 = 964 => x = 964 * 272 = 262208
  • 6940 - x = 6748 => x = 6940 - 6748 = 192

г)

  • x · 789 = 3156 => x = 3156 / 789 = 4
  • 3211 - x = 55 => x = 3211 - 55 = 3156
  • x : 407 = 789 => x = 789 * 407 = 321123
  • 789 · x = 5523 => x = 5523 / 789 = 7

Финальный ответ:

а) x ≈ 5, x = 1193, x = 8650, x ≈ 571

б) x = 738, x = 2280, x = 927, x = 8

в) x = 7, x = 2, x = 262208, x = 192

г) x = 4, x = 3156, x = 321123, x = 7

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