Tính P biết : P = ( $2^{9}$ + $2^{7}$ + 1 ) . ( $2^{23}$ - $2^{21}$ + $2^{19}$ - $2^{17}$ + $2^{14}$ - $2^{10}$ + $2^{5}$ - $2^{7}$ + 1 )