(m^2-4)(n^2-9)+24mn
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(m^2-4)(n^2-9)+24mn(m^2-4)(n^2-9)+24mn(m^2-4)(n^2-9)+24mn原式=m²n²-4n²-9m²+36+24mn
(m^2-4)(n^2-9)+24mn
(m^2-4)(n^2-9)+24mn
(m^2-4)(n^2-9)+24mn
原式=m²n²-4n²-9m²+36+24mn
=(m²n²+12mn+36)-(9m²-12mn+4n²)
=(mn+6)²-(3m-2n)²
=(mn+3m-2n+6)(mn-3m+2n+6)
(mn+3n-2n+6)*(mn+2n-3m+6)
若m-n=4,mn=-1求(9-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)
(m^2-4)(n^2-9)+24mn
[(m+n)^2-4mn][(m-n)^2+4mn]+2(mn)^2
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