( 5 + 2 )X-1 ≥ ( 5 − 2 )XX+-11 (CAO §¼NG SP KÜ THUËT VINH - 2001

4) - TUYEN TAP CAC BAI PT VA BPT MU QUA CAC DE THI DH
TUYEN TAP CAC BAI PT VA BPT MU QUA CAC DE THI DH

4) ( 5 + 2 )

x-1

≥ ( 5 − 2 )

xx+-11

(Cao §¼ng SP kü thuËt Vinh - 2001