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把9(x-y)2+12(x2-y2)+4(x+y)2因式分解是(  )
A. (3x-2y)(3x+2y)
B. (5x+y)2
C. (5x-y)2
D. (5x-2y)2
人气:439 ℃ 时间:2020-03-27 14:42:22
解答
9(x-y)2+12(x2-y2)+4(x+y)2
=[3(x-y)]2+12(x+y)(x-y)+[2(x+y)]2
=[3(x+y)+2(x-y)]2
=(5x-y)2
故选C.
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