(+1)+(-3)+(+5)+(-7)+````````+(2005)+(-2007)怎么做啊
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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)
(-5)*(+7 1/3)+(+7)*(-7 1/3)-(+12)*7 1/3 简便方法计算
两题算24点.1、(7、7、3、3)2、(5、5、5、1)
计算 (1)(1-105×(3/1-7/3-7/5-5/2)怎么算的 式子 105×(3/1-7/3-7/5-5/2)
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)
(4/5+1/4)÷7/3+7/10
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:
7分之3除【7分之5-(7分之3+5分之1)】简便计算
简算 (2+3+1/5)+(2/3-5/17)-(1/5+12/7)
(1-3/2*4)*(1-3/3*5)*...*(1-3/7*9)
找规律1,2,3,5,8,()()7,8,6,7,5,()()
-0.25/(-3/7)x(3/7)x(-1-1/5)
1/(1*3*5)+1/(3*5*7)+1/(5*7*9)+1/(7*9*11).+(25*27*29)
1/(1×3×5)+1/(3×5×7)+1/(5×7×9)+1/(7×9×11)+...+1/(2001×2003×2005)=?
1+3+5= 1+3+5+7= 1+3+5+7+.+(2n-1)=
(7+4√3)(7-4√3)-(3√5-1)²
1-3+5-7+...
简算(5/9×7/10-1/3)×6/5