preg 1
(m+n)(m-n)(m-n)
diferencia de cuadrados
(m^2-n^2)(m-n)
m^3-nm^2-n^2m+n^3
ordenando
m^3+n^3-m^2n-mn^2
rpta E
preg2
(p+q+r)(p-r)+(p+q)(p-r)
factorizando p-r
(p-r)(2p+2q+r)
multiplicando
2p^2+2pq+pr-2pr-2qr-r^2
2p^2-pr+2pq-2qr-r^2
rpta c
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preg 1
(m+n)(m-n)(m-n)
diferencia de cuadrados
(m^2-n^2)(m-n)
m^3-nm^2-n^2m+n^3
ordenando
m^3+n^3-m^2n-mn^2
rpta E
preg2
(p+q+r)(p-r)+(p+q)(p-r)
factorizando p-r
(p-r)(2p+2q+r)
multiplicando
2p^2+2pq+pr-2pr-2qr-r^2
ordenando
2p^2-pr+2pq-2qr-r^2
rpta c