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