2的次方根式化簡
考慮 (2+1)×(22+1)×(24+1)×(28+1)× … ×(264+1)×(2128+1) +1
=(22-1)×(22+1)×(24+1)×(28+1)× … ×(264+1)×(2128+1) +1
=(24-1)×(24+1)×(28+1)× … ×(264+1)×(2128+1) +1
=(28-1)×(28+1)× … ×(264+1)×(2128+1) +1
………
=(264-1)×(264+1)×(2128+1) +1
=(2128-1)×(2128+1) +1
=2256-1+1
=2256
=(2128)2
故原式=2128
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