20 |
x2+2x |
A.y2-8y-20=0 | B.8y2-20y+1=0 |
C.y2+8y-20=0 | D.20y2+8y-1=0 |
1 |
y |
3 |
x2+3x |
A.1 | B.-3和1 | C.3 | D.-1或3 |
1 |
x-1 |
2x |
x+1 |
2x |
x2-1 |
3x2-3 |
x |
x |
x2-1 |
x2 |
x-3 |
2x |
3-x |
x |
x-3 |
7 |
2x |
x-1 |
5x-7 |
x2-x |
x2-1 |
x |
x |
x2-1 |
x2-1 |
x |
A.y2-y+2=0 | B.y2+y-2=0 | C.y2-2y+1=0 | D.y2+2y-1=0 |
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