x(x-9)≥0 x≥0 x≥0
2x≥1 x-9≥0 x≥9
2x≥1 x≥1/2 т.е 0,5
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x(x-9)≥0 x≥0 x≥0
2x≥1 x-9≥0 x≥9
2x≥1 x≥1/2 т.е 0,5