0Đ. <-> X – 5 ≤ 0 <-> X ≤ 5

1, - DE DAP AN THI HSG TOAN 67 8 HUYEN THANH OAI
Lớp 6 Toán DE DAP AN THI HSG TOAN 67 8 HUYEN THANH OAI

1,0đ.

<-> x – 5 ≤ 0 <-> x ≤ 5