设Y x 、Z x 、U x 分别是下列差分方程的解 y x+1 +ay x =f 1 (x),y x+1 +ay x =f 2 (x) y x+1 +ay x =f 3 (x) 求证:V x =Y x +Z x +U x 是差分方程y x+1 +ay x =f 1 (x)+f 2 (x)+f 3 (x)的解.
【简答题】The electronic delivery of B(s)/L will speed up the trade finance process,eliminate the risk of errors and reduce the cost of manual document preparation.( )