(7-5根号2)^2000 * (-7-5根号2)

(7-5根号2)^2000 * (-7-5根号2)^2001

7个回答

原式=-(7-5根号2)^2000 *(7+5根号2)^2001
=(7-5根号2)^2000 *1/(7-5根号2)^2001
=1/(7-5根号2)
=-7-5根号2