2 下列何者可為 y"−2y'+2y = 0 之解? )
(A)y=ex
(B)y=ex+cosx
(C)y=cosx
(D)y=excosx
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統計: A(2), B(0), C(0), D(5), E(0) #1021939
統計: A(2), B(0), C(0), D(5), E(0) #1021939