A.(x—y)10 B.-(x—y)10 C.10(x—y)9 D.-10

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问题 A.(x—y)10B.-(x—y)10C.10(x—y)9D.-10(x-y)9

选项 A.(x—y)10
B.-(x—y)10
C.10(x—y)9
D.-10(x-y)9

答案 C

解析
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