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计算(x4+y4)(x2+y2)(y-x)(x+y)的结果是
A.
x8-y8
B.
x6-y6
C.
y8-x8
D.
y6-x6
计算(x4+1)(x2+1)(x+1)(x-1)的结果是
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计算下列各式,结果是x8的是