m |
s |
n |
t |
4 |
9 |
x2 |
4 |
y2 |
2 |
A.x-2y+1=0 | B.2x-y-1=0 | C.2x+y-3=0 | D.x+2y-3=0 |
1 |
9 |
m |
s |
n |
t |
1 |
9 |
mt |
s |
ns |
t |
1 |
9 |
mn |
1 |
9 |
m |
n |
4 |
9 |
1 |
9 |
m |
n |
4 |
9 |
m |
n |
x1+x2 |
2 |
y1+y2 |
2 |
x12 |
4 |
y12 |
2 |
x22 |
4 |
y22 |
2 |
(x1+x2)(x1-x2) |
4 |
(y1+y2)(y1-y2) |
4 |
y1-y2 |
x1-x2 |
1 |
2 |
1 |
2 |
1 |
2 |
x2 |
a2 |
y2 |
b2 |
5 |
x2 |
4 |
y2 |
5 |
x2 |
a2 |
y2 |
b2 |
3 |
A.x2-
| B.x2+
| C..x2+
| D.x2-
|
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