1. 5/4
2. 4/5
3. 9/16
4. 16/9
5/4
1. 20
2. 30
3. 60
4. 55
60
1. straight line
2. circle
3. ellipse
4. parabola
ellipse
1. 0
2. (-1)n-1
3. -1
4. 1
(-1)<sup>n-1</sup>
1. x2+y2-6x+2y-6=0
2. x2+y2-6=0
3. x2+y2-3x+y-6=0
4. x2+y2=0
x<sup>2</sup>+y<sup>2</sup>-6x+2y-6=0
1. |z|
2. |z|2
3. 2|z|2
4. (1/2)|z|2
(1/2)|z|<sup>2</sup>
1. y-3x=4
2. y-3x+4=0
3. 3x-y=0
4. 3x-y=1
y-3x=4
1. (2, 4)
2. (3, 4)
3. (1, 4)
4. (-2, 1)
(1, 4)
1. 1
2. 2
3. 3
4. 4
4
1. (1, -1)
2. (-1, 1)
3. (-1, -1)
4. (1, 1)
(1, 1)