раскройте скобки а)4у-(3у-(2у+1)) ,a-(2x-(2a-x)),

4у-(3у-(2у+1)) == 4y-(3y-2y -1) == 4y - 3y +2y +1 == 3y +1a-(2x-(2a-x)) = = a- (2x - 2a +x) = = a - 2x +2a -x_ = = 3a - 3x