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下列多项式中,能用完全平方公式分解因式的是
A.x2-8x+9
B.-m2+6m-9
C.a2-6a-9
D.-x2-4x+9
A.m2-mn+n2
B.a2-b2-2ab
C.x2-2x+
D.x2+2x-1
A.x2+2xy+2y2
B.-xy+y2
C.x2+2xy-y2
D.-x2+2xy+y2
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