A.
| B.4-0.25m2 | C.1+a2 | D.-a4+1 |
1 |
4 |
A.x2-y2=(x-y)(x+y) | B.x2-2xy+y2=(x-y)2 |
C.x2y-xy2=xy(x-y) | D.x3-x=x(x2-1) |
A.①和② | B.③和④ | C.①和④ | D.②和③ |
A.x(x4-64) | B.x(x2+8)(x2-8) | ||||||||
C.x(x2+8)(x+2
| D.x(x+2
|
A.4x2+y2 | B.-4x2-y2 | C.-4x2+y2 | D.-4x+y2 |
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