Как изменится площадь прямоугольника если одну пару противоположных сторон увеличить на 30% а другую уменьшить на 20%​

1,8/3,6=0,5

x/(x+6)=0,5

x=6

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1,8/3,6=0,5

x/(x+6)=0,5

x=6

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