Сравните значения выражений не выполняя указанных вычислений. Поясните свои ответы.
(248+622)+1927 и 248+(622+1927)
(700+300)+50 и 700+(290+50)
(10×8)×7 и 10×(8×5)
(20×3)×9 и 20×(3×9)
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