(1+2分之1²-2²)(2+3分之2²-3²).(99+100分之99²-100²)
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(1+2分之1²-2²)(2+3分之2²-3²).(99+100分之99²-100²)
(1+2分之1²-2²)(2+3分之2²-3²).(99+100分之99²-100²)
(1+2分之1²-2²)(2+3分之2²-3²).(99+100分之99²-100²)
(1+2+·····+99)+ { 99 - [(1/2)² +(1/3)² +·····(1/100)² ] } - [(1²+2²+3²+····100²)-1] ,剩下的自己用数列公式计算,很简单的.