若1/(1×3)+1/(3×5)+1/(5×7)+……+1/(2n-1)(2n+1)的值为17/35,求n的值
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若1/(1×3)+1/(3×5)+1/(5×7)+……+1/(2n-1)(2n+1)的值为17/35,求n的值若1/(1×3)+1/(3×5)+1/(5×7)+……+1/(2n-1)(2n+1)的值为
若1/(1×3)+1/(3×5)+1/(5×7)+……+1/(2n-1)(2n+1)的值为17/35,求n的值
若1/(1×3)+1/(3×5)+1/(5×7)+……+1/(2n-1)(2n+1)的值为17/35,求n的值
若1/(1×3)+1/(3×5)+1/(5×7)+……+1/(2n-1)(2n+1)的值为17/35,求n的值
即1/2×(1-1/3)+1/2×(1/3-1/5)+……+1/2×[1/(2n-1)-1/(2n+1)]=17/35
1/2×[1-1/3+1/3-1/5+……+1/(2n-1)-1/(2n+1)]=17/35
1/2×[1-1/(2n+1)]=17/35
n/(2n+1)=17/35
所以35n=17(2n+1)
35n=34n+17
n=17
提示一下:1/(2n-1)(2n+1)=1/2* 【1/(2n-1)-1/(2n+1)]
原始变成 1/2*[1-1/(2n+1)]=17/35
1、1、2、3、5、( )、( ).
(1+2/1)(1+4/1)(1+6/1).(1+10/)(1-3/1)(1—5/1).(1-9/1)
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.(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)=
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)
计算 ( 1+1/2)*(1-1/3)*(1+1/4)*(1-1/5)*.*(1+1/1000)*(1-1/1001)
1/1*3=1/2(1-1/3)1/3*5=1/2(1/3-1/5)1/5*7=1/2(1/5-1/7).1/17*19=1/2(1/17-1/19)所以1/1*3+1/3*5+1/5*7+.1/17*19=1/2(1-1/3)+1/2(1/3+1/5)+1/2(1/5-1/7)+.1/2(1/17-1/19)=1/2(1-1/3+1/3-1/5+1/5-1/7+1/7.+1/17-1/19)=1/2(1-1/1
已知1-2/1=2/1,2/1-3/1=6/1,3/1-4/1=12/1,根据这些等式解答下列各题.(1)求值:1/1*2+1/2*3+1/3*4+1/4*5+1/5*6(2)化简:1/1*2+1/2*3+1/3*4+...+1/n(n+1)(3)若1/1*2+1/2*3+1/3*4+...+1/n(n+1)=19/20
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:
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