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探索规律观察下面由※组成的图案和算式,解答问题: (1)请猜想1+3+5+7+9+…+19= ...
探索规律观察下面由※组成的图案和算式,解答问题: (1)请猜想1+3+5+7+9+…+19= ...
2025-04-05 14:23:27
推荐回答(1个)
回答1:
解:(1)1+3+5+7+9+…+19=100;
(2)1+3+5+7+9+…+(2n-1)=n
2
;
(3)103+105+107+…+2003+2005
=(1+3+5+7+9+…+2005)-(1+3+5+7+9+…+101)
=
=1003408
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