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1で割る(2掛ける6)+1で割る(6掛ける10)+1で割る(10掛ける14)+.1で割る(42掛ける46)=1/4(1/2-1/6+1/10-1/10-1/14......1/42-1/46)=1/4(1/2-1/46)=1/4*22/46=11/92
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