(x+1/x)(x^2+1/x^2)(x^4+1/x^4)(x^8+1/x^8)(x^16+1/x^16)(x^2-1) 乘以(x-1/x)后同时再除以它=(x-1/x)(x+1/x)(x^2+1/x^2)(x^4+1/x^4)(x^8+1/x^8)(x^16+1/x^16)(x^2-1)/(x-1/x) =(x^2-1/x^2)(x^2+1/x^2)(x^4+1/x^4)(x^...