摘要： (a) The graph of y = x3 is dilated by factor 2 from the x axis, reflected in the x axis and then translated 3 units to the right. Write down the equation of the graph after each of the three transformations. (i) (ii) (iii) (b) Sketch the graph following all the transformations.
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已知奇函数y＝f(x)在区间(－∞，0]上的解析式为f(x)＝x2＋x
，则切点横坐标为1的切线方程是 ( )
A．x＋y＋1＝0 B．x＋y－1＝0
C．3x－y－1＝0 D．3x－y＋1＝0
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>1的一个充分不必要条件是( )
的直线的方程是( )