A) (X + 1)(X + 3) – X (X + 2) = 7 B) 2X(3X + 5) - X (6X - 1) = 33 C) (3X2 – X + 1)(X – 1) + X2(4 – 3X) = 52D) (12X – 5)(4X – 1) + (3X – 7)(1 – 16X) = 81 2 2E)(X − 3)(X + 3X + + 9) X(5 X ) − = 6X F) (X – 2)3 – X(X + 1)(X – 1) + 6X2 = 5 G) (X...
Bài 3. Tìm x, biết:
a) (x + 1)(x + 3) – x (x + 2) = 7
b) 2x(3x + 5) - x (6x - 1) = 33
c) (3x
2
– x + 1)(x – 1) + x
2
(4 – 3x) = 5
2
d) (12x – 5)(4x – 1) + (3x – 7)(1 – 16x) = 81
2
2
e)(x − 3)(x + 3x + + 9) x(5 x ) − = 6x
f) (x – 2)
3
– x(x + 1)(x – 1) + 6x
2
= 5
g) (x – 2)
3
– (x + 5)(x
2
- 5x + 25) + 6x
2
= 11
h) (x + 3)
3
– x(3x + 1)
2
+ (2x + 1)(4x
2
– 2x + 1) – 3x
2