Rut gen bien this. ay (5x-2y) (x²- xy+1) + xy (7x-2y) (x-1) (x+1)(x+2) - (x²-1) (x+2) (x+y) (x² - xy + y²) + (x − y) (x² + xy + y) 5 tim Tìm x biết: 3 a) (12x-5) (4x-1) + (3x-7)(1-16x) = 81 (x+1)(x²x+1)x(x²-3)=4 9 (x-3) (x²+3x+9) + x (5=x³)=6x d, (x-2)(x+3)=(x+4) (x-7)=5=x Ô tìm 3 số t ...