简便计算下列式子

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简便计算下列式子

简便计算下列式子
简便计算下列式子

简便计算下列式子

             =(a^2-4)(a^4+4a^2+16)                           =(x+y)^2(x^2-xy+y^2)^2
             =a^6-64                                                  =[(x+y)(x^2-xy+y^2)][(x+y)(x^2-xy+y^2)]
                                                                           =(x^3+y^3)^2
                                                                           =x^6+2x^3y^3+y^6