תשובה:
# (sqrt (10) -qqrt (5)) / (sqrt (10) + sqrt (5) = 3-2sqrt (2) #
הסבר:
# (sqrt (10) -qqrt (5)) / (sqrt (10) + sqrt (5) #
# sql (לבן) (=) (=) (/) ()
# sql (לבן) ("XXX") = (sqrt) 2) -1 / (sqrt) 2) 1) * (sqrt (2) -1) / (sqrt (2) -1)
(#) (#) (לבן) ("XXX") = (sqrt (2) -1) ^ 2 / ((sqrt (2) ^ 2-1 ^ 2)
#color (לבן) ("XXX") = (2-2sqrt2 + 1) / (2-1) #
#color (לבן) ("XXX") = 3-2sqrt (2) #
