2X1 + X -1 = 0 ; 2) 3X2 + 2X = 2 X2X + 1 – X

1. - BO DE THI HSG TOAN 9 CO DAP AN
BO DE THI HSG TOAN 9 CO DAP AN
1.

2

x

1

+ x -1 = 0 ; 2) 3x

2

+ 2x = 2

x

2

x

+ 1 – x