найдите координаты вершины парабол:
1.у=х²-4х-5
2.у=х²+3х+5
3.у=-х²-2х+5
4.у=-х²+5х-1
1.у=х²-4х-5
2.у=х²+3х+5
3.у=-х²-2х+5
4.у=-х²+5х-1
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