观察式子(1-1/2²)(1-1/3²）=(1-1/2)(1+1/2)(1-1/3)(1+1/3)=1/2x3/2x2/3x4/3=2/3试求试求(1-1/2²）(1-1/3²)x…x(1-1/2009²)(1-1/2010²）的值

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