2 |
x |
1 |
x2 |
1 |
x |
1 |
x |
1 |
x |
1 |
x |
1 |
x |
-3±
| ||
2 |
-3+
| ||
2 |
-3-
| ||
2 |
-3+
| ||
2 |
-3-
| ||
2 |
1 |
x2+x |
1 |
x2+3x+2 |
1 |
x2+5x+6 |
1 |
x2+7x+12 |
4 |
21 |
3 |
x2+3x-7 |
A.60 | B.一60 | C.10 | D.一10 |
x |
x-1 |
k |
x2-1 |
x |
x+1 |
A.2 | B.1 | C.不为2或一2 | D.无法确定 |
x2+3x |
2x2+2x-8 |
x2+x-4 |
3x2+9x |
11 |
12 |
13x-x2 |
x+1 |
13-x |
x+1 |
a |
x |
5a |
x |
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