BÀI 2 (2,0 ĐIỂM) + += −2 3 9A XX X XCHO BIỂU THỨC 2 1= −B X X− + VỚI...

3 : 3P B x x− −2 1 3x x= ⋅P− +3 3

( )( )

− − −2 1 3 2 1x x x= =− + +3 3 3

( ) ( )

+ − + − −2 3 7 2 3 7 7= = + = +3 3 3 2 3+ + + +x x x xTa có: 7 7≥ ⇔ + ≥ ⇒ ≥0 3 3+ x7 7⇒ = + ≥ +2 2+1⇒ ≥P −3Vậy 1MinP = −3 khi x =0

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