(1+3)+(1+3+5)+(1+3+5+7)+……+(1+3+5+7+9+11+13+17+19+21)怎么做?用等差数列做.
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1、1、2、3、5、( )、( ).
3/5-3/1表示( )
1,1,2,3,3,5,( ),( )
(1-3/2*4)*(1-3/3*5)*...*(1-3/7*9)
-(3-5)+3²x(1-3)
1,2,3,5,( ),( ),21.
+2006)-(1+3+5+.+2005)
简便运算 (1+1/3+1/5+1/7)*(1/3+1/5+1/7+1/9)-(1+1/3+1/5+1/7+1/7+1/9)*(1/3+1/5+1/7)
-1-2又1/3+4又1/5除以(-3)除以(-3/5)
1,1,1,3,5,9,( ),( )
算术题,(1+1/3+1/5+1/7)×(1/3+1/5+1/7+1/9)-(1+1/3+1/5+1/7+1/9)×(1/3+1/5+1/7)
log1/3(1/5),log1/5(1/3),log5(1/3),log3(1/5)比较大小
(2*3*4*5)*(1/2-1/3-1/4-1/5)
数奥题(1+1/3+1/5+1/7)*(1/3+1/5+1/7+1/9)-(1+1/3+1/5+1/7+1/9)*(1/3+1/5+1/7)求(1+1/3+1/5+1/7)*(1/3+1/5+1/7+1/9)-(1+1/3+1/5+1/7+1/9)*(1/3+1/5+1/7)的简便算法要求:
1.(1+1/2+1/3+1/4)*(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4)=2.(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)=
0-(+2/1)-(+5/2)-(-4/3)-(+4/1)-(-5/3)
简算 (2+3+1/5)+(2/3-5/17)-(1/5+12/7)
1 1 2 3 5 8 () () ()