求(1+1)*(1+1/2)*(1+1/4)*(1+1/8)*.*(1+1/2048)

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求(1+1)*(1+1/2)*(1+1/4)*(1+1/8)*.*(1+1/2048)

(1+1)*(1+1/2)*(1+1/4)*(1+1/8)*.*(1+1/2048)
=(1+1)*2*(1-1/2)*(1+1/2)*(1+1/4)*(1+1/8)*.*(1+1/2048)
=(1+1)*2*(1-1/4)*(1+1/4)*(1+1/8)*.*(1+1/2048)
=……
=(1+1)*2*(1-1/2048)*(1+1/2048)
=2*2*(1-1/2^12)
=4-(1/2^10)