中1數學1題要步驟thx

2010-07-20 1:53 am
Find the value of the expression (-101)+102+(-103)+104+...+(-199)+200.
要步驟。

回答 (1)

2010-07-20 2:20 am
✔ 最佳答案
大概是這樣:
(-101)+102
=1
(-103)+104
=1
(-199)+200
=1
(-101)+102+(-103)+104+...+(-199)+200.
=1+1...+1
=1x(100/2)
=50


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