初二数学,我这题不懂,求过程(手写的可以!)
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(1-1/2^2)(1-1/3^2)(1-1/4^2)......(逗唤1-1/2013^2)
=(1+1/2)(1-1/2)(1+1/3)(1-1/3)(1+1/4)(1-1/4)......(1+1/2013)(1-1/2013)
=[(1+1/2)(1+1/山槐凯3)(1+1/明贺4)......(1+1/2013)][(1-1/2)(1-1/3)(1-1/4)......(1-1/2013)]
=[(3/2)(4/3)(5/4)......(2014/2013)][(1/2)(2/3)(3/4).......(2012/2013)]
=(2014/2)(1/2013)=1007/2013
=(1+1/2)(1-1/2)(1+1/3)(1-1/3)(1+1/4)(1-1/4)......(1+1/2013)(1-1/2013)
=[(1+1/2)(1+1/山槐凯3)(1+1/明贺4)......(1+1/2013)][(1-1/2)(1-1/3)(1-1/4)......(1-1/2013)]
=[(3/2)(4/3)(5/4)......(2014/2013)][(1/2)(2/3)(3/4).......(2012/2013)]
=(2014/2)(1/2013)=1007/2013
追问
谢谢!辛苦啦
追答
懂了就好
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