Question

1/rút gọn biểu thức

a)(x-4)^3 - 2x(x-5)^2 + (x-4)(x^2+4x+16)-(x-3)^3

b)(x+5)(x^2-5x+25)-(x+3)^3+(x-2)(x^2+2x+4)-(x-1)^3

c)(x+3y)^3 +(3x+2y)(9x^2-6xy+4y^2)-3(2x-y)^3

d)(3x+y)^3-(5x-y)(25x^2+5xy+y^2)+(x+2y)^3

cảm ơn mn ạ