Укажите уравнения парабол, ветви которых направлены вниз:
1) y= - x2
2) y=(-5)2 x2
3) y= (-1)3x2
4) y= -2x2 – 3x +2
1) y= - x2
2) y=(-5)2 x2
3) y= (-1)3x2
4) y= -2x2 – 3x +2
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1) и 4) - это точно------------------------------------