=x^(m-4)(x的4次方-1)
=x^(m-4)(x²+1)(x²-1)
=x的(m-4)次方(x²+1)(x+1)(x-1)第一步是怎么变化出来的啊？提取公因式 x的m次方=x的m-4次方×x的4次方
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