ada yang bisa ini nggak?

a) K = x+x+(x-y)+(x-y)+y+y = 2x + 2x - 2y + 2y = 4x
    L1 = x . x = x2
    L2 = y . y = y2
    Ltotal = L1-L2 = x2-y2
b) K = a+b+a+b+a+b+3a+3b = 6a+6b
    L1 = 3a . 3b = 9ab
    L2 = 2a . b = 2ab
    L3 = a.b =ab
    Ltotal = 9ab-2ab-ab = 6ab
c) sm d) kayaknya soalnya keterangannya salah
    

a. k: x+x+x+-y+y+y+x-y
     =4x
  L= x²-y²
b. k= a+b+a+b+a+b+3a+3b
     = 6a+6b
  L= L1+L2+L3
   =3ab+2ab+ab
   =6ab
c. k= y+x+y+(x-z)/2+z+z+z+(x-z)/2
     = y+y+x+z+z+z+(x-z+x-z
     = 2y+x+3z+(2x-2z)/2 = x-z
     = 2y+2x+2z
   L= (x.y)-(z.z)
     = xy-z²
d. k= 8(r-p)/2+4(3p)
     = 4r-4p+12p
       =4r+8p
   L= r²-4p²²