| ||
2 |
c |
a |
| ||
2 |
x2 |
4b2 |
y2 |
b2 |
4 |
4b2 |
1 |
b2 |
x2 |
8 |
y2 |
2 |
6 |
1 |
2 |
1 |
2 |
6 |
1 |
2 |
| ||
2 |
y1-1 |
x1-2 |
y2-1 |
x2-2 |
y1-1 |
x1-2 |
y2-1 |
x2-2 |
(y1-1)(x2-2)+(y2-1)(x1-2) |
(x1-2)(x2-2) |
(
| ||||
(x1-2)(x2-2) |
x1x2+(m-2)(x1+x2)-4(m-1) |
(x1-2)(x2-2) |
1 |
2 |
|
2m2-4+(m-2)(-2m)-4(m-1) |
(x1-2)(x2-2) |
2m2-4-2m2+4m-4m+4 |
(x1-2)(x2-2) |
A.第一象限 | B.第二象限 | C.第三象限 | D.第四象限 |
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