Brief calculation:2009÷2009 and 2009/2010+1/2011

2009÷2009 And 2009/2010+1/2011
=2009÷(2009*2010+2009)/2010+1/2011
=2009*2010/(2009*(2010+1))+1/2011
=(2010+1)/2011
=1

Calculation:(2011/1-1)(2010/1-1)(2009/1-1)...(3/1-1)(2/1-1)

If what you write is correct, then the solution is simplified as follows:2010*2009*2008*.*2*1 If the original formula should be,(1/2011-1)(1/2010-1)(1/2009-1)...(1/3-1)(1/2-1) then simplify and get,2010/2011*(-2009/2010)*(-2008/2009).(-2/3)*(-1/2) get,...

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