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Математика. 4 класс. Учебник - 2я часть. Школа России. Упражнение №219(2). Страница 59.

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для проверки: 2000-450*342:900=2000-450*342:(450*2)=2000-450*342:450:2=2000-450:450*342:2=2000-(450:450)*342:2=2000-(1)*342:2=2000-342:2=2000-171=1829

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