5.A. 2≠ B. 2≤ <X 5. XC. X3−4X= ⇔ =0 X 0;X=2;X= −2.  ≥D.X3−4X=...

5 . - 2 DE THI HOC KY 1 TRAC NGHIEM TOAN 10
2 DE THI HOC KY 1 TRAC NGHIEM TOAN 10
5.

A.

2≠

B.

2≤ <x 5.

x

C.

x

3

−4x= ⇔ =0 x 0;x=2;x= −2.

 ≥

D.

x

3

−4x= ⇔ =0 x 0

hoặc

x

2

− =4 0.2 ≠