Chọn mệnh đề sai trong các mệnh đề dưới đây.
\((2;\dfrac{9}{2})=\left\{x\in R|2\le x\le\dfrac{9}{2}\right\}\).\([2;\dfrac{9}{2}]=\left\{x\in R|2\le x\le\dfrac{9}{2}\right\}\).\([2;\dfrac{9}{2})=\left\{x\in R|2\le x< \dfrac{9}{2}\right\}\).\((2;\dfrac{9}{2}]=\left\{x\in R|2< x\le\dfrac{9}{2}\right\}\).