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1+2+3+……+1000=1/2*1000*1001=500500
1000+1=1001
它是個以1為首項,1000為末項,公差為1的等差數列的前1000項和,可用等差數列的前n項和的公式來求,S1000=((1+1000)×1000)/2=500500
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