Đáp án:
Giải thích các bước giải:
12x2+5x−12y2+12y−10xy−312x2+5x-12y2+12y-10xy-3
=12x2+8xy−4x−18x−12y2+6y+9x+6y−3=12x2+8xy-4x-18x-12y2+6y+9x+6y-3
=(12x2+8xy−4x)−(18x+12y2−6y)+(9x+6y−3)=(12x2+8xy-4x)-(18x+12y2-6y)+(9x+6y-3)
=4x(3x+2y−1)−6y(3x+2y−1)+3(3x+2y−1)=4x(3x+2y-1)-6y(3x+2y-1)+3(3x+2y-1)
=(4x−6y+3)(3x+2y−1)