A=1999 x 2011 – 1999/2010 x 1998 -2010

2 bình luận về “A=1999 x 2011 – 1999/2010 x 1998 -2010”

1. A = ( 1999 xx 2011 – 1999 )/( 2010 xx 1998 – 2010 )

   => A = ( 1999 xx 2011 – 1999 xx 1 )/( 2010 xx 1998 – 2010 xx 1 )

   => A = ( 1999 xx ( 2011 – 1 ) ) /( 2010 xx ( 1998 – 1 ) )

   => A = ( 1999 xx 2010 )/( 2010 xx 1997 )

   => A = 1999/1997

   Vậy : A = 1999/1997

    

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2. A=(1999xx2011-1999)/(2010xx1998-2010)

   =(1999xx2011-1999xx1)/(2010xx1998-2010xx1)

   =(1999xx(2011-1))/(2010xx(1998-1))

   =(1999xx2010)/(2010xx1997)

   =1999/1997

    

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