Ayuda porfavor es para mañana?

A. <img src="https://tex.z-dn.net/?f=3x%5E%7B2%7Dy-2xy%5E%7B2%7D%20%3D%203%28-2%29%5E%7B2%7D%283%29-2%28-2%29%283%29%5E%7B2%7D%20%3D3%284%29%283%29-2%28-2%29%289%29%3D36-%28-36%29%3D36%2B36%3D72" />b.

<img src="https://tex.z-dn.net/?f=-%5Cfrac%7B1%7D%7B2%7Dx%5E%7B3%7Dy%5E%7B2%7D%2B3x%5E%7B2%7Dz%5E%7B2%7D%3D-%5Cfrac%7B1%7D%7B2%7D%28-2%29%5E%7B3%7D%283%29%5E%7B2%7D%2B3%28-2%29%5E%7B2%7D%284%29%5E%7B2%7D%3D4%289%29%2B3%28-4%29%284%29%3D36-48%3D-12" />c.

<img src="https://tex.z-dn.net/?f=x%5E%7B2%7D%28y-2%29-y%28x%2B2%29%2B3y%5E%7B3%7D%3D%28-2%29%283-2%29-3%28-2%2B2%29%2B3%283%29%5E%7B3%7D%3D-2-0%2B81%3D79" />d.

<img src="https://tex.z-dn.net/?f=%5Cfrac%7B2%7D%7B3%7Dx%5E%7B3%7Dy%5E%7B2%7Dz-5x%5E%7B2%7Dy%5E%7B3%7Dz%5E%7B2%7D%2B10%3D%5Cfrac%7B2%7D%7B3%7D%28-2%29%5E%7B3%7D%283%29%5E%7B2%7D%284%29-5%28-2%29%5E%7B2%7D%283%29%5E%7B3%7D%284%29%5E%7B2%7D%2B10%3D-192-8640%2B10%3D-8822" />e.

<img src="https://tex.z-dn.net/?f=%5Cfrac%7B3%7D%7B4%7D%28-2%29%283%29%5E%7B2%7D%284%29%5E%7B3%7D-%28-2%29%5E%7B2%7D%283%29%5E%7B3%7D%284%29%5E%7B2%7D%2B%28-2%29%5E%7B3%7D%283%29%5E%7B2%7D%284%29%5E%7B3%7D-%5Cfrac%7B1%7D%7B2%7D%3D%5Cfrac%7B3%7D%7B4%7D%28-2%29%289%29%284%29-%284%29%2827%29%2816%29%2B%28-8%29%289%29%2864%29-%5Cfrac%7B1%7D%7B2%7D%3D-54-1728-4608-%5Cfrac%7B1%7D%7B2%7D%3D-6390" />.