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二次函数沿着斜线(有斜率的直线)平移,怎么计算?
其实,无论直线怎么倾斜,这个点拆解开来:还是先水平方向移动,再竖直方向移动。 D的横坐标是-2,那么说明(2,9)向左移动了4个单位,水平距离是4。
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