计算1/2+(1/3+2/3)+(1/4+2/4+3/4)+(1/5+2/5+3/5+4/5)+.+(1/50+2/50
1个回答
以0.5为首项,公差为0.5的等差数列,一共49项
(0.5+24.5)x49/2=612.5
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((1-2+3-4+5…-100)+(1-2+3-4+5…-100))*(-100)+50=