(3m-4n)(4n+3m)-(2m-n)(2m+n)

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(3m-4n)(4n+3m)-(2m-n)(2m+n)

(3m-4n)(4n+3m)-(2m-n)(2m+n)
(3m-4n)(4n+3m)-(2m-n)(2m+n)

(3m-4n)(4n+3m)-(2m-n)(2m+n)
(3m-4n)(4n+3m)-(2m-n)(2m+n)
=(9m²-16n²)-(4m²-n²)
=9m²-16n²-4m²+n²
=5m²-15n²

(3m-4n)(4n+3m)-(2m-n)(2m+n)
=9m²-16n²-(4m²-n²)
=5m²-15n²

(9m^2-16n^2)-(4m^2-n^2)=5m^2-15n^2

前面两位,答错了
应该是
原式=(3m)^-(4n)^- [(4m)^-n^]
=9m^-16n^-16m^+n^
=-7m^-15n^