X( X-2 ) + X - 2 = 0 2/ 5X( X-3 ) - X+3 = 0

1/ - DE KIEM TRA TIET 21 DAI SO
DE KIEM TRA TIET 21 DAI SO

1/ x( x-2 ) + x - 2 = 0 2/ 5x( x-3 ) - x+3 = 0