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raywalker3410
05.05.2021 •
Mathematics
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Ответ:
so, we solve the equation: 3 x l^2 = (10 + l)^2;
then, 3 x l^2 = 100 + 20 x l + l^2;
finally, 2xl^2 - 20xl - 100 = 0; / ÷2;
l^2 - 10l - 50 = 0 (we use the quadratic equation formula);
the only positive solution is l = 5(1+ \sqrt{3} );