Изобразите схематично график функции:
1) y=[tex]-2 x^{2} +x+6[/tex]

2) y=[tex] \frac{1}{4} x^{2} + \frac{1}{4} - \frac{x}{2} [/tex]

3)y=[tex](2x-1)^{2} - (x+2)^{2} [/tex]

4) y=[tex]- x^{2} +x-2[/tex]
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