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2の2000乗+2の1999乗 =2の2009乗*(2+1) =3*2の2009乗
(5/13)^1999×(2+3/5)^2000 =(5/13)^1999×(13/5)^2000 =(5/13)^1999×(13/5)^1999×13/5 =1^1999×13/5 =13/5
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