X 1 x 2 x 3 x 4 x 100 July 8, 2019 16 32 64 128 X 1 x 2 x 3 x 4 x 99 x 100 x 200 Let f x )=( x 1 )( x 2 )( x 3 )( x 4 x 100 and g x 1 x 2 x 3 2 x 3 x 4 98 x 99 x 100 Coefficient of x 2009 in 1 x x 2 x 3 x 4 1001 1 x 1002 Tính tổng a 1 x 2 2 x 3 3 x 4 98 x 99 99 x 100
