Summer Clouds moderators
30/06/2017 at 17:13-
\(m^3+n^3=m^3+3m^2n+3mn^2+n^3-3m^2n-3mn^2\)
\(=\left(m+n\right)^3-3mn\left(m+n\right)=3^3-3\times2\times3=27-18=9\)
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giabao246 01/07/2017 at 20:34
You can refer to how to do offline
M^3+n^3
=>m^3+3 m^2+3mn^2+n^3-3m^2-3mn^2
=>(M+n)^3-3mn(m+n)
=>3^3-3 x 2 x 3
=>27-18=9
