①（1+1/2)(1+1/2²)(1+1/2^4)(1+1/2^8)+1/2^15=(1-1/2)（1+1/2)(1+1/2²)(1+1/2^4)(1+1/2^8)/(1-1/2)+1/2^15=(1-/2^16)*2+1/2^15=2②（1-1/2²）（1-1/3²)(1-1/4²)……(1-1/10²)=(1-1/2...