原式=(2x^2-1/2)(2x^2+1/2)×()()/(256x^16-1/256) =(4x^4-1/4)(4x^4+1/4)( )/(256x^16-1/256) =(16x^8-1/16)(16x^8+1/16)/(256x^16-1/256) =(256x^16-1/256)/(256x^16-1...