\(A=\sqrt{x^2+2\sqrt{x^2-1}}-\sqrt{x^2-2\sqrt{x^2-1}}\)

với giá trị nào của x thì A có nghĩa?

1.          I have  to work hard.  => I wish .…I didn’t have to work hard………………………..

2.          Jack is late for work.  => ……I wish Jack were soon for work………………………………………..

3.          She has a cold.           => ………I wish she didn’t have a cold………………………………..

4.          It’s a pity. He doesn’t join with us.

        => ……I wish he joined with us………………………………..

5.          She can’t do this test because it is difficult.

        => ………She wishes this test is easy………………………………………

đúng chưa vậy mọi người, cảm ơn nhiều ạ=)))