Question

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Answer 1

$frac{(x-20)^2}{4} geq frac{(9x-5)^2}{9}\ 9(x-20)^2-4(9x-5)^2 geq 0 \(x^2-40x+400)cdot9-4(81x^2-90x+25) geq 0\ 9x^2-360x+3600-324x^2+360x-100 geq 0\ 9x^2-100 leq 0\ 9x^2 leq 100\ -10 leq 3x leq 10\ - frac{10}{3} leq x leq frac{10}{3}$

Ответ: $[-frac{10}{3};frac{10}{3}]$