Calculate (1-2:1) times (1-3:1) times. times (1-2009:1) times (1-2010:1)

Use square difference
=(1-1/2)(1+1/2)(1-1/3)(1+1/3)…… (1-1/2010)(1+1/2010)
=(1/2)(3/2)(2/3)(4/3)…… (2009/2010)(2011/2010)
About minutes in the middle
=(1/2)(2011/2010)
=2011/4020

(-2) Divided by 2(2012), how much? (-2) Divided by 2 for 2012, how much?

Into the same document
Original formula =(-2)^2012×(-2)÷2^2012
=2^2012÷2^2012×(-2)
=-2.

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