k + ( m+n ) ,   k - ( m+n ) ,   ( x-y) + ( a +b ) ,   ( a - c ) - ( b - d) ,    -k- ( m - n ) , k- ( -m -n)  ,    -a + ( b - c ) - (x - y) ,    25 - ( m -n) - (a-b) -------- Решите, правила раскрытия скобок.
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