(1-2/1)3/1-1)(1-4/1)(5/1-1)…(2009/1-1)(1-2010/1)等于几?
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(1-2/1)3/1-1)(1-4/1)(5/1-1)…(2009/1-1)(1-2010/1)等于几?(1-2/1)3/1-1)(1-4/1)(5/1-1)…(2009/1-1)(1-2010/1)
(1-2/1)3/1-1)(1-4/1)(5/1-1)…(2009/1-1)(1-2010/1)等于几?
(1-2/1)3/1-1)(1-4/1)(5/1-1)…(2009/1-1)(1-2010/1)等于几?
(1-2/1)3/1-1)(1-4/1)(5/1-1)…(2009/1-1)(1-2010/1)等于几?
(1-2/1)(3/1-1)(1-4/1)(5/1-1)…(2009/1-1)(1-2010/1)
=1/2×(-2/3)×3/4×(-4/5)×……×(-2008/2009)×2009/2010
总共有2010-1=2009个数,则负数的个数为(2009-1)÷2=1004个,所以积是正数
= 1/2010
题目你能看懂吗?重写一次,定帮你解答!
200*(1-1/2)*(1-1/3)*(1-1/4)*.*(1-1/100)
(1-2/1)*(1-3/1)*(1-4/1)*.*(1-2007/1)*(1-2008/1)
(1+2/1)(1+4/1)(1+6/1).(1+10/)(1-3/1)(1—5/1).(1-9/1)
(1-1/2)(1-1/3)(1-1/4).(1-1/100)
(-1×1/2)+(-1/2×1/3)+(-1/3×1/4)+…+(-1/2008×1/2009)
(-1*1/2)+(-1/2*1/3)+(-1/3*1/4).(-1/2012*1/2013)
计算 ( 1+1/2)*(1-1/3)*(1+1/4)*(1-1/5)*.*(1+1/1000)*(1-1/1001)
(-1/2)-(-1/3)-(+1/4)
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)=
计算:(1/50-1)(1/49-1)(1/48-1)…(1/4-1)(1/3-1)(1/2-1)
(1-1/100)(1-1/99)(1-1/98)...(1-1/4)(1-1/3)(1-1/2)求和
(1/100-1)(1/99-1)(1/98-1).(1/4-1)(1/3-1)(1/2-1)等于多少?
100/1-1)(99/1-1)(98/1-1)…(4/1-1)(3/1-1)(2分之1-1)
(1-1/2)*(1/3-1)*(1-1/4)*(1/5-1)…(1/2009-1)*(1-1/2010)等于多少
(1-2/1)3/1-1)(1-4/1)(5/1-1)…(2009/1-1)(1-2010/1)等于几?
计算:(1+1/2)×(1-1/3)×(1+1/4)×(1-1/5)×.×(1+1/1000)×(1-1/1001)
计算:(1-1/2)(1/3-1)(1-1/4)(1/5-1)……(1-1/2010)(1/2011-1)
(1-1/2)*(1-1/3)*(1-1/4)*……*(1-1/2008)*(1-1/2009)*(1-1/2010)