1+2+3+4+5+6+7........+100=???

2008-05-01 5:40 am

1+2+3+4+5+6+7........+100=???

fast!!!!!!!!!!!!!!

回答 (6)

2008-06-11 2:48 am

:''''
.........

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2008-05-02 12:51 am

5050
1+2+3+4+5...................................................+100 =5050

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2008-05-01 5:53 am

[(頭+尾) x 項數]÷2

頭:1
尾:100
項數:100

[(1+100) x 100 ]÷2
=5050

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2008-05-01 5:49 am

答案:5050
方法:(1+100)*50(因有50個101)

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2008-05-01 5:44 am

=101+101+101........

=101x50

=5050

參考: me

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2008-05-01 5:43 am

=5050

1+100=101
2+99=101
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49+52=101
50+51=101

101*50=5050

參考: me

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