13 下列何者為方程式
之解?
(A)u = f (x − 4y)
(B)u = f (x + 4y)
(C)u = f (4x − y)
(D)u = f (4x + y)
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統計: A(2), B(1), C(1), D(0), E(0) #1031485
統計: A(2), B(1), C(1), D(0), E(0) #1031485