Bài 4: Tìm x biết: a) \(5x(12x + 7) - 3x(20x - 5) = -100\) b) \((2x - 1)(3x + 1) + (3x + 4)(3 - 2x) = 5\) c) \(5x(2x - 7) + 2x(8 - 5x) = 5\) d) \(0,6x(x - 0,5) - 0,3x(2x + 1,3) = 0,38\) e) \(6x^2 - (2x - 5)(3x - 2) = 7\) f) \((x - 3x)(x + 6) + x(3x^2 + 17x) = 24\) g) \(x(x^2 - 1) + x^2(3 - x) = 0\) h) \(3x(12x - 4) - 9x(4x - 3) = 30\) i) \((x - 1)(x^2 + x + 1) + 9 = 0\) j) \((12x - 5)(4x - 1) - (3x - 7)(1 + 16x) = 81\)

----- Nội dung ảnh -----
Bài 4:
Tìm x biết:
a) \(5x(12x + 7) - 3x(20x - 5) = -100\)
b) \((2x - 1)(3x + 1) + (3x + 4)(3 - 2x) = 5\)
c) \(5x(2x - 7) + 2x(8 - 5x) = 5\)
d) \(0,6x(x - 0,5) - 0,3x(2x + 1,3) = 0,38\)
e) \(6x^2 - (2x - 5)(3x - 2) = 7\)
f) \((x - 3x)(x + 6) + x(3x^2 + 17x) = 24\)
g) \(x(x^2 - 1) + x^2(3 - x) = 0\)
h) \(3x(12x - 4) - 9x(4x - 3) = 30\)
i) \((x - 1)(x^2 + x + 1) + 9 = 0\)
j) \((12x - 5)(4x - 1) - (3x - 7)(1 + 16x) = 81\)