A.①② | B.①③ | C.②③ | D.①⑤ |
A.x2-x+
| B.a4+b2-2a2b | C.m4-25 | D.x2+2xy-y2 |
A.①② | B.②③ | C.①④ | D.②④ |
A.x2+9y2 | B.y2-2y+1 | C.-x2-4y2 | D.-4y2+x2 |
A.a2b2-ab | B.(x-y)2+(y-x) | C.0.36x2-6
| D.(-x)2+
|
A.-a2b2+16 | B.-a2b2-16 | C.a2b2+16 | D.(ab+16)2 |
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