>
数学
>
把9(x-y)
2
+12(x
2
-y
2
)+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:147 ℃ 时间:2020-03-27 14:42:22
解答
9(x-y)
2
+12(x
2
-y
2
)+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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