Ответы на вопрос:
M^2 / ( m - 4n ) - ( 16n^2 - 8mn ) / ( 4n - m ) = ( - m^2 - 16n^2 + 8mn ) / ( 4n - m ) = ( m^2 - 8mn + 16n^2 ) / ( m - 4n ) = ( m - 4n )^2 / ( m - 4n ) = m - 4n
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