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抛物线平移时,形状和开口方向不变,位置要改变.形状和开口方向不变,得到的二次项系数就不变.位置改变,其实就是顶点坐标在改变.
When the parabola translates, the shape and direction of the opening do not change and the position changes. The shape and the direction of the opening do not change, and the quadratic coefficient obtained does not change. When the position is changed, the vertex coordinate is actually changing.