3A - 5  3B – 5; D

9/ - ON TAP TRAC NGHIEM TU LUAN KY 2
ON TAP TRAC NGHIEM TU LUAN KY 2

9/ Nếu a

b, thì :

A. 3a

3b ; B. -5a

-5b ; C. 3a - 5

3b – 5; D. 10 – 2a

10 – 2b.