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анонимЗапишем краткое условие:
280 га = 100 % + 12 %;
х га = 100 %;
280 га = 112 %;
х га = 100 %.
Составим пропорцию:
280 : 112 = х : 100;
Чтобы найти средний неизвестный член пропорции необходимо умножить крайние члены и их произведение разделить на известный средний член.
х = 280 * 100 : 112;
х = 250 (га) - должен был вспахать тракторист.
Ответ: тракторист должен был вспахать 250 га земли.
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