m^2+2mn=384,3mn+2n^2=560,则2m^2+13mn+6n^2-444的值是( )
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m^2+2mn=384,3mn+2n^2=560,则2m^2+13mn+6n^2-444的值是()m^2+2mn=384,3mn+2n^2=560,则2m^2+13mn+6n^2-444的值是()m^
m^2+2mn=384,3mn+2n^2=560,则2m^2+13mn+6n^2-444的值是( )
m^2+2mn=384,3mn+2n^2=560,则2m^2+13mn+6n^2-444的值是( )
m^2+2mn=384,3mn+2n^2=560,则2m^2+13mn+6n^2-444的值是( )
2m^2+13mn+6n^2-444
=2m^2+4mn+9mn+6n^2
=2(m^2+2mn)+3(3mn+2n^2)
=2×384+3×560-444
=2004
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