A.3(x+y) B.3(x+y)2 C.6(x+y) D.6(x+y)2

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问题 A.3(x+y)B.3(x+y)2C.6(x+y)D.6(x+y)2

选项 A.3(x+y)
B.3(x+y)2
C.6(x+y)
D.6(x+y)2

答案 C

解析
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