8+11+14+17+20+·······+305 数学计算题.呜呜呜
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8+11+14+17+20+·······+305 数学计算题.呜呜呜
1+2+3+4+···················+98+99+100+99+98+···············+3+2+1
1+2+3+4+···················+98+99+100+99+98+···············+3+2+1
![8+11+14+17+20+·······+305 数学计算题.呜呜呜](/uploads/image/z/4273955-35-5.jpg?t=8%2B11%2B14%2B17%2B20%2B%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%2B305+%E6%95%B0%E5%AD%A6%E8%AE%A1%E7%AE%97%E9%A2%98.%E5%91%9C%E5%91%9C%E5%91%9C)
8+11+14+17+20+·······+305
=(8+305)*100/2=313*50
1+2+3+4+···················+98+99+100+99+98+···············+3+2+1
=1+2+3+4+···················+98+99++100+100+99+98+···············+3+2+1-100
=(1+2+3+4+···················+98+99++100)+(1+2+3+4+···················+98+99++100)-100
=10000
=(8+305)*100/2=313*50
1+2+3+4+···················+98+99+100+99+98+···············+3+2+1
=1+2+3+4+···················+98+99++100+100+99+98+···············+3+2+1-100
=(1+2+3+4+···················+98+99++100)+(1+2+3+4+···················+98+99++100)-100
=10000