Как раскрыть?
(5m+4n)(4n-5m)
20mn-25mm+16nn-20nm; 16nn-25mm
(5m+4n)(4n-5m)=20mn-25m^2+16n^2-20mn=-25m^2+16n^2
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20mn-25mm+16nn-20nm; 16nn-25mm
(5m+4n)(4n-5m)=20mn-25m^2+16n^2-20mn=-25m^2+16n^2