1⼀2×5+1⼀5×8+1⼀8×11……+1⼀2003+2006+1⼀2006+2009

简便计算方法(/分数线)1/2*5+1/5*8+1/8*11+.+1/2003*2006+1/2006*2009
2025-03-02 04:25:34
推荐回答(1个)
回答1:

1/2*5+1/5*8+1/8*11+.+1/2003*2006+1/2006*2009
=(1/2-1/5)/3+(1/5-1/8)/3+.+(1/2003-1/2006)/3+(1/2006-1/2009)/3
=(1/2-1/2009)/3
=669/4018