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2の2010乗×(-2分の1)の2009乗 =-2 x 2の2009乗x(1/2)の2009乗 =-2 x(2 x 1/2)の2009乗 =-2 x 1 =-2
2の2010乗-2の2009乗-2の2008乗-2の2乗-1 =2の2010乗-2の2010乗+1 =1
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