原式=（2x-1)(2x+1)(2x∧2+1/2)(4x∧4+1/4)(16x∧8+1/16)/2(256x∧16-1/256)=(4x^2-1)(2x∧2+1/2)(4x∧4+1/4)(16x∧8+1/16)/2(256x∧16-1/256)反费用=(256x∧16-1/256)/2(256x∧16-1/256)=1/2
