BT1: Tính

1) \(\dfrac{1}{2011}+\dfrac{2012.2010}{2011}-2012\)

2) \(\left(2-\dfrac{2}{3}\right)\left(2-\dfrac{4}{3}\right)\left(2-\dfrac{5}{4}\right)\left(2-\dfrac{6}{5}\right)\)

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