CÂU 3 1/  14X + 7X < 20 – 130.5  21X < 7  X < 1/3.0.5

2/ - DE KIEM TRA HKII TOAN 8
DE KIEM TRA HKII TOAN 8

2/

6(x-1) + 4(2-x) ≤ 3(3x-3)

0.25

6x -6 + 8 – 4x ≤ 9x – 9

6x-4x-9x ≤ 6-8-9

-7x≤-11

x≥ 11/7

0.5