(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. 查看更多

 

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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(  )

A.x>y                  B.x>y>0

C.x<y                             D.y<x<0

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已知A(-4,-5)、B(6,-1),则以线段AB为直径的圆的方程是(  )

A.(x+1)2+(y-3)2=29

B.(x-1)2+(y+3)2=29

C.(x+1)2+(y-3)2=116

D.(x-1)2+(y+3)2=116

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与直线2xy+1=0的距离为的直线的方程是(  )

A.2xy=0

B.2xy-2=0

C.2xy=0或2xy-2=0

D.2xy=0或2xy+2=0

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已知直线经过A(a,0)、B(0,b)和C(1,3)三个点,且ab均为正整数,则此直线方程为(  )

A.3xy-6=0

B.xy-4=0

C.3xy-6=0或xy-4=0

D.无法确定

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