Bài 2: Tìm x biết
a) 3x(1-x) + (3x-2)(x + 3) = -27
b) x(x-9) - (x - 1)(x+1) = 27
c) 6x(5x + 3) + 3x(1 - 10x) = 7
Bài 2: Tìm x biết
a) 3x(1-x) + (3x-2)(x + 3) = -27
b) x(x-9) - (x - 1)(x+1) = 27.
c) 6x(5x + 3) + 3x(1 - 10x) = 7
e) (3x - 3)(5-21x) + (7x+4) (9x - 5) = 44
f) (x + 1)(x + 2) - x(x + 8) = 27
