SUMA Y RESTA DE POLINOMIOS (2ac + 2ab - bc) - (3ab - 2bc) [tex](2m ^ {3} - 3n ^ {3}) + (4m ^ {2}n - 6mn ^ {2}) - (m ^ {3} + 3m ^ {2} n + 3mn ^ {2} + n ^ {2} )[ / tex] [tex](a ^ {3} + b ^ {2} + ab + b + a ^ {2}) + (b ^ {3} - a ^ {2} + ab + a - b ^ {2} ) - (a + 2ab + b)[ / tex].
En resumen
<img src="https://tex.z-dn.net/?f=2%20m%5E%7B3%7D%20-3n%20%5E%7B3%7D%2B4m%20%5E%7B2%7D%20n-6mn%20%5E%7B2%7D%20-m%20%5E%7B3%7D-3m%20%5E%7B2%7D%20n-3mn%20%5E%7B2%7D%20-n%20x%5E%7B2%7D%20%20%20%0A" /> <img src="https://tex.z-dn.net/?
<img src="https://tex.z-dn.net/?f=2%20m%5E%7B3%7D%20-3n%20%5E%7B3%7D%2B4m%20%5E%7B2%7D%20n-6mn%20%5E%7B2%7D%20-m%20%5E%7B3%7D-3m%20%5E%7B2%7D%20n-3mn%20%5E%7B2%7D%20-n%20x%5E%7B2%7D%20%20%20%0A" />
<img src="https://tex.z-dn.net/?f=m%20%5E%7B3%7D%20-3n%20%5E%7B3%7D%20%2Bm%20%5E%7B2%7D%20n-9mn%20%5E%7B2%7D%20-n%20%5E%7B2%7D%20" />
<img src="https://tex.z-dn.net/?f=a%20%5E%7B3%7D%20%2Bb%20%5E%7B2%7D%2Bab%2Bb%2Ba%20%5E%7B2%7D%20%2Bb%20%5E%7B3%7D%20-a%20%5E%7B2%7D%2Bab%2Ba-b%20%5E%7B2%7D%20%20-a-2ab-b%20" />
<img src="https://tex.z-dn.net/?f=a%20%5E%7B3%7D%20%2Bb%20%5E%7B3%7D%20" />.
Espero que te ayude, aqui tienes la solución.
A(c - d) + b(c - d) (a + b)(c - d).
Lo resolvi completo y da 843.