1) (аb + 6b) + (ac + 6c) = b • ( a + 6 ) + c • ( a + 6 ) = (b + c ) + ( a + 6 )
2) ( 4a - 4c ) - ( ba - bc ) = 4 • ( a - c ) - b • ( a - c ) = (4 - b ) • ( a - c )
3) ( 7x + 7y ) + (ax + ay) = 7 • ( x + y ) + a • ( x + y ) = ( 7 + a ) • ( x + y )
4) ( xy - y ) + ( xz - z ) = y• ( x - 1 ) + z • ( x - 1 = ( y + z ) • ( x - 1 )
5 и 6 не знаю, прости
1) (аb + 6b) + (ac + 6c) = b • ( a + 6 ) + c • ( a + 6 ) = (b + c ) + ( a + 6 )
2) ( 4a - 4c ) - ( ba - bc ) = 4 • ( a - c ) - b • ( a - c ) = (4 - b ) • ( a - c )
3) ( 7x + 7y ) + (ax + ay) = 7 • ( x + y ) + a • ( x + y ) = ( 7 + a ) • ( x + y )
4) ( xy - y ) + ( xz - z ) = y• ( x - 1 ) + z • ( x - 1 = ( y + z ) • ( x - 1 )
5 и 6 не знаю, прости