Tìm x, biết
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Bài 3.
Tìm x, biết:
a) \( 3x(x+1) - (x-2)(3x+1) = 12 \)
b) \( (3x^2 - x + 1)(x - 1) + x^2(4 - 3x) = \frac{5}{2} \)
c) \( (x + 3)(5x - 1) = 5(x + 1)(x - 2) \)
d) \( (2x - 3)(x + 1) = 2x(x - 1) \)
e) \( \frac{1}{4} - x - \left(-\frac{1}{2} x - 4\right) \frac{1}{2} x = -14 \)
f) \( 3(1 - 4x)(x - 1) + 4(3x - 2)(x + 3) = -27 \)
Bài 3.
Tìm x, biết:
a) \( 3x(x+1) - (x-2)(3x+1) = 12 \)
b) \( (3x^2 - x + 1)(x - 1) + x^2(4 - 3x) = \frac{5}{2} \)
c) \( (x + 3)(5x - 1) = 5(x + 1)(x - 2) \)
d) \( (2x - 3)(x + 1) = 2x(x - 1) \)
e) \( \frac{1}{4} - x - \left(-\frac{1}{2} x - 4\right) \frac{1}{2} x = -14 \)
f) \( 3(1 - 4x)(x - 1) + 4(3x - 2)(x + 3) = -27 \)