x+1 |
x-1 |
4 |
x2-1 |
A.x=1 | B.x=-1 | C.x=1或x=-1 | D.x=0 |
3 |
2 |
3 |
1 |
2 |
3 |
2x-4 |
x |
x-2 |
1 |
2 |
b |
a-b |
a |
a-b |
a-a2 |
a2-1 |
a |
a-1 |
a+1 |
a-1 |
1 |
4 |
8 |
x+1 |
x+3 |
x+1 |
1 |
2x |
2 |
x+3 |
x-2 |
x+2 |
16 |
x2-4 |
x+2 |
x-2 |
x-8 |
x-7 |
k |
7-x |
A.1 | B.-1 | C.±1 | D.7 |
1 |
a |
1 |
b |
1-3x |
1+3x |
3x+1 |
3x-1 |
12 |
1-9x2 |
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