(2X + 1) = 0 B) (4X1)2 9 0C) (3 X)2 (2X1)2D) 1 9 X2 6X

bài 3. - DE KIEM TRA TIET 21 DAI SO
DE KIEM TRA TIET 21 DAI SO
Bài 3. Tìm x, biết: a) 4x

2

– 1 – x.(2x + 1) = 0 b)

(4

x

1)

2

9 0

c)

(3

x

)

2

(2

x

1)

2

d) 1 9 x

2

6x