原式=（1+2^1/8）(1+2^1/4)(1+2^1/2) =(1+2^1/4+2^1/8+2^3/8)(1+2^1/2)=1+2^1/4+2^1/8+2^3/8+2^1/2+2^3/4+2^5/8+2^7/8你要看不懂的话给你化成这种形式=1+2^0.25+2^0.125+2^0.375+2^0.5+2^0.75+2^0.625...