(1-1⼀2)+(1⼀2-1⼀3)+(1⼀3-1⼀4)+……(1⼀1999-1⼀2000)

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2024-12-13 00:38:23
推荐回答(5个)
回答1:

(1-1/2)+(1/2-1/3)+(1/3-1/4)......+(1/1999-1/2000)
1-1/2+1/2-1/3+1/3-1/4+……+1/1998-1/1999+1/1999-1/2000
=1-(1/2-1/2)-(1/3-1/3)-.......(1/1999-1/1999)-1/2000
=1-1/2000
=1999/2000
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回答2:

1-1/2+1/2-1/3+1/3-1/4……+1/1999-1/2000
=1-1/2000
=1999/2000

回答3:

去掉括号
=1-1/2+1/2-1/3+1/3.......-1/1999+1/1999-1/2000
=1-1/2000
=1999/2000

回答4:

(1-1/2)+(1/2-1/3)+(1/3-1/4)+……(1/1999-1/2000)
=1-1/2+1/2-1/3+1/3-1/4+……+1/1998-1/1999+1/1999-1/2000
=1-1/2000
=1999/2000

回答5:

1-1/2000=1999/2000