x-1 |
2 |
1 |
4 |
A.4 | B.3 | C.2 | D.1 |
x-1 |
2 |
(x-1)2 |
4 |
1 |
4 |
1 |
2 |
1 |
4 |
A.4x2-12xy-9y2 | B.-4x2-12xy-9y2 |
C.4x2+12xy+9y2 | D.4x2-12xy-9y2 |
A.3xy | B.2xy | C.xy | D.0 |
A.2x2-2x+1 | B.x2-2xy+y2 |
C.4x2+4x+1 | D.9x2+16y2-24xy |
A.8 | B.-2 | C.-8 | D.-2或8 |
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