Длина прямоуогольника на 5 см больше ширины.какую ширину должен иметь прямоугольник,чтобы его площадь была больше 36 см вквадрате
AlinaAlina707
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01.03.2019 16:40
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2
х - ширина
х+5 - длина
х(х+5)=36
х^2+5x-36=0
D=5^2+4*36=169
x=-9 - сторона не может быть отрицательной
х=4 - ширина прямоугольника