x |
x-2 |
x |
x-2 |
x |
x-2 |
x |
x-2 |
12 |
5 |
x |
x-2 |
12 |
5 |
2 |
5 |
12 |
5 |
2 |
x |
2 |
x |
2 |
x |
A.y2-y+1=0 | B.y2+y+1=0 | C.y2+y-1=0 | D.y2-y-1=0 |
x |
x-1 |
2 |
1+x |
4 |
x2-1 |
a2-4 |
a-2+4 |
2 |
1-x2 |
1 |
x+1 |
1 |
x2 |
2 |
x2 |
1 |
x2 |
A.-4、2 | B.4 | C.4、-2 | D.无答案 |
4 |
x |
4 |
x2 |
4 |
x |
A.-2 | B.2 | C.4 | D.-2或4 |
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