Tính

C=(x-y) ^2 +2(x^2 -y^2)+(x+y) ^2
D= (1-2x)(4x^2+2x+1)+8(x-1)(x^2+x+1)
E=(4-x) (x^2+4x+16)+(x+1)(x^2-x+1)


Cứu tui vs. ..π_π