若 a、b 為有理數， c、d 為無理數，且b≠ 0，則下列何者恆為真？(A) 為有理數　(B) b+ac為無理數　(C) ac+bd 為無理數　(D) ab+c為有理數 (E)c-d為無理數。-58題庫

1. 若 a、b 為有理數， c、d 為無理數，且b≠ 0，則下列何者恆為真？
(A) 為有理數　
(B) b+ac為無理數　
(C) ac+bd 為無理數　
(D) ab+c為有理數
(E)c-d為無理數。

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