|
1 |
2 |
AM |
MB |
1 |
2 |
1 |
2 |
AM |
MB |
1 |
2 |
1 |
2 |
|
|
1 |
2 |
2x1 |
1-2x1 |
2x2 |
1-2x2 |
2x1(1-2x2)+2x2(1-2x1) |
(1-2x1)(1-2x2) |
2(x1+x2)-8x1x2 |
(1-2x1)(1-2x2) |
2(x1+x2)-8x1x2 |
1-2(x1+x2)+4x1x2 |
2-8x1x2 |
-1+4x1x2 |
a |
b |
c |
c |
a |
b |
A.m≠-
| B.m≠5 | C.m≠-7 | D.m≠-
|
AC |
CB |
OB |
m |
n |
m |
n |
a |
b |
c |
a |
b |
A.(-∞,-3)∪(-3,+∞) | B.{-3} |
C.(-3,+3) | D.(0,+∞) |
PA |
PB |
PC |
0 |
AB |
AC |
AP |
A.2 | B.3 | C.4 | D.5 |
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