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（1+1/2;）*（1+1/悔芹2²)*(1+1/2四次方）*（1+1/2八次方）+1/2十五次方
=2*(1-1/2)[（1+1/碧洞毕2;）*（1+1/2^2;)*(1+1/2^4）*（1+1/2^8）]+1/2^15
=2*(1-1/2^2)(1+1/2^2;)*(1+1/2^4）*（1+1/2^8）+1/2^15
=2*(1-1/颤山2^4)(1+1/2^4）*（1+1/2^8）+1/2^15
=2*(1-1/2^8)(1+1/2^8）+1/2^15
=2*(1-1/2^16)+1/2^15
=2-1/2^15+1/2^15
=2
（1+1/2;）*（1+1/2²)*(1+1/2四次方）*（1+1/谈唤腔2八次方）+1/2十五含衫次方
=2*(1-1/2)[（1+1/2;）*（1+1/2^2;)*(1+1/2^4）*（1+1/2^8）]+1/2^15
=2*(1-1/2^2)(1+1/链橡2^2;)*(1+1/2^4）*（1+1/2^8）+1/2^15
=2*(1-1/2^4)(1+1/2^4）*（1+1/2^8）+1/2^15
=2*(1-1/2^8)(1+1/2^8）+1/2^15
=2*(1-1/2^16)+1/2^15
=2-1/2^15+1/2^15
=2