8 класс.
1)
[tex]2x {}^{2} - 6x \leqslant 0[/tex]
2)
[tex] - 3x {}^{2} + 5x \leqslant 0[/tex]
3)
[tex] - x {}^{2} + 4x - 4 \leqslant 0[/tex]
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