1+3=( ) 1+3+5=( ) 1+3+5+9=( ) 1+3+5+7+9=( ).有什么规律?1+3+5+7+9+...+2013等于多少?说明原因、谢谢!
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/10 17:28:47
xRmN@
[Hl,z!"~ Q
m+>bͦ7vf*$[GBb#H"a|V(AQ_$
T9G=ho,{1Rl͌m\gx%uY]R)DbmbXwp+1~K/
1/1*3+1/3*5+.+1/1997*1999=
5-x/3=1
计算(+5/2)-(-5/3)=-5/1(-5/2)-(-5/3)=5/12/1-3/1=6/1(-2/1)-3/1=-6/1
1 2 3 4 5=1
1-1/8x=3/5
1/5x+1=3-x
[(-5)-(-1/3)+1/7]+(-105)=
1()2()3()4()5=1
5(x-1)=3(x+1)
1+1-2+3-4+5=?
1=5 2=1 5 3=2 1 5 4=3 2 1 5 5=?
巧算:(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)=====
|2/1-1|=|5/1-3/1|=|4/3-5/4|=
-5X-2/1=3/1(X-3/1)
1+2+3-4-5+1+1+2+3=
(1-x/3)/(1-x/5)=1/3
(1-x/3)/(1-x/5)=1/3
3+1/2+1/3+1/4+5=?