докажите неравенство:

[tex]{m}^{2} - mn + {n}^{2} \geqslant mn[/tex]

[tex] {a}^{2} - a \leqslant 50 {a}^{2} - 15a + 1[/tex]

[tex] \frac{c}{ {c}^{2} + 1} \leqslant \frac{1}{2} [/tex]
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