TỠM X BIẾT A) (X -1)3 = 27; B) X2 + X = 0; C) (2X + 1)2 = 25; C) (2X -...

Bài 1: Tỡm x biết

a) (x -1)

3

= 27; b) x

2

+ x = 0; c) (2x + 1)

2

= 25; c) (2x - 3)

2

= 36; e) 5

x + 2

= 625;

d) (x -1)

x + 2

= (x -1)

x + 4

; e) (2x - 1)

3

= -8. f) 1 2 3 4 5 30 31

. . . . ... .

4 6 8 10 12 62 64 = 2

x

;