已知1-1⼀2=1⼀2,1⼀2-1⼀3=1⼀6,1⼀3-1⼀4=1⼀12,1⼀4-1⼀5=1⼀20……根据这些等式求值。1⼀1*2+1⼀2*3+1⼀3*4+……

2025-01-04 02:15:57
推荐回答(4个)
回答1:

1/1*2+1/2*3+1/3*4+……+1/2008*2009
=1-1/2+1/2-1/3+1/3-1/4+...........+1/2008-1/2009
=1-1/2009
=2008/2009

回答2:

解:1/1*2+1/2*3+1/3*4+……+1/2008*2009
=1-1/2+1/2-1/3+1/3-1/4+...+1/2008-1/2009
=1-1/2009
=2008/2009

回答3:

1/1*2+1/2*3+1/3*4+……+1/2008*2009
=1-1/2+1/2-1/3+1/3-1/4+……+1/2008-1/2009
=1-1/2009
=2008/2009

回答4:

解:1/1*2+1/2*3+1/3*4+……+1/2008*2009
=1-1/2+1/2-1/3+1/3-1/4+...+1/2008-1/2009
=1-1/2009
=2008/2009
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