(1)观察下列算式:
1=12, 1+3=4=22 , 1+3+5=9=32,1+3+5+7=16=42……
按规律填空:①1+3+5+7+9= ;②1+3+5+…+2005=
(2)已知a、b互为相反数,c、d互为倒数,求
的值;
1=12, 1+3=4=22 , 1+3+5=9=32,1+3+5+7=16=42……
按规律填空:①1+3+5+7+9= ;②1+3+5+…+2005=
(2)已知a、b互为相反数,c、d互为倒数,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0215de9e04316487d5a81b2d9da1737.png)
更新时间:2016-12-06 02:57:47
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