Объяснение:1) (5x-2)(3x-4) = 15x^2-6x-20x+8
2) (3x+12)(4x-2)-24^2= 12х^2+48x-6x-24-24^2=12x^2+42x-24-24^2
3) (4х-3)^2-2x(8x-12)=4x^2-9-16x^2-24x=12x^2-9-24x
Объяснение:1) (5x-2)(3x-4) = 15x^2-6x-20x+8
2) (3x+12)(4x-2)-24^2= 12х^2+48x-6x-24-24^2=12x^2+42x-24-24^2
3) (4х-3)^2-2x(8x-12)=4x^2-9-16x^2-24x=12x^2-9-24x