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S=1+(2/3)+(2/3)二次方+(2/3)三次方+……+(2/3)n次方(1) 2/3S=(2/3)+(2/3)二次方+(2/3)三次方+……+(2/3)n次方+(2/3)n+1次方(2) 1/3S=S-2/3S=(1)-(2)=1-(2/3)n+1次方 所以:S=3-2(n+1次方)/3(n次方)
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