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2 - 1 - 2 - 3 - "" 4 - 5 - 6 - 7 - : b aU U n n + = +1 a≠0 b≠0 - - 1 - : N N : * N {1} N * ÷ * 1 :) U n ( U n (U n ) U n (U n ) . * 2 :n 0 n 1 U n = (U n)…