71 x 11⁴ - ( 6 x 11³ + 5 x 11² ) =
= 71 x 11⁴ - 11² x ( 6 x 11 + 5 ) =
= 71 x 11⁴ - 11² x 71 =
= 71 x 11² x ( 11² - 1 ) =
= 71 x 121 x ( 121 - 1 ) =
= 71 x 121 x 120 =
= 8 591 x 120 =
= 1 030 920
