简便计算 1⼀2+1⼀6+1⼀12+1⼀20+...+1⼀9900

2025-02-01 13:50:08
推荐回答(2个)
回答1:

=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+……+1/99-1/100
=1-1/100
=99/100

回答2:

1/2+1/6+1/12+1/20+...+1/9900
=1/1*2+1/2*3+1/3*4+...+1/99*100
=1-1/2 +1/2-1/3 + 1/3-1/4 +... +1/99-1/100
=1-1/100
=99/100