x2 |
a2 |
y2 |
b2 |
5π |
6 |
| ||
2 |
MD |
DN |
5π |
6 |
b |
a |
| ||
3 |
1 |
2 |
1 |
2 |
| ||
2 |
a2+b2 |
3 |
x2 |
3 |
x2 |
3 |
MD |
DN |
2t |
t2+3 |
-2 |
t2+3 |
2t |
t2+3 |
-2 |
t2+3 |
x2 |
3 |
12k |
3k2+1 |
9 |
3k2+1 |
7 |
6 |
7 |
6 |
A.{-1,1} | B.{x|x≠0} | C.R | D.Ø |
A.1 | B.-1,1 | C.-1 | D.0 |
A.1条 | B.2条 | C.3条 | D.多于3条 |
A.2x-y-5=0 | B.x+2y-3=0 | C.x+2y+3=0 | D.2x-y-1=0 |
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