A(2Đ)≥ 0A DẤU “=” XẢY RA KHI A=0

5. - DE THI OLYMPIC TOAN 6 7 8
Lớp 6 Toán DE THI OLYMPIC TOAN 6 7 8
5.a(2đ)

≥ 0

a

dấu “=” xảy ra khi a=0. Ta cú:1đ

− x x x x x

2011

x

2008 + − = − + − ≥ − + − =

2008

3