原式=(x²-1/4)[(x²)²-1/2x²+1/16)=(1/2-1/4)(1/4-1/2×1/2+1/16)=1/2×1/16=1/32
(x+1/2)(x-1/2)(x^4-1/2x^2+1/16)=(x^2-1/4)(x^2(x^2-1/2)+1/16)将x^2=1/2带入上式=1/4(1/2(1/2-1/2)+1/16)=1/64
