(1+1/2)(1+1/4)(1+1/16)(1+1/256) 等于多少?快

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(1+1/2)(1+1/4)(1+1/16)(1+1/256) 等于多少?

原式=(1-1/2)(1+1/2)(1+1/4)(1+16)(1+1/256)/(1-1/2)=2(1-1/4)(1+1/4)(1+1/16)(1+1/256)=2(1-1/16)(1+1/16)(1+1/256)=2(1-1/(256^2))=65535/32768

(1+1/2)*(1+1/4)*(1+1/16)*(1+1/256) = 1.9999694824219