Doprowadź wyrażenia do najprostszej postaci :

a) ( 4a – 3b ) (3b + 4a ) – 2a ( 2a – 3b ) =

b) –2 (4x – 2y )(3y – 4x ) +3x( 2x – 4y ) –3y( 4x + 2y )=

c)–4a( 6a – b ) +3b( 5b – 2a ) –4( 3a + 2b )( 4b – 2a )=

d) ( 5x – 3y ) (3y + 2x ) – 2x ( 3x – 4y ) =

e) –5 (3a – 2b)(2b – 3a )+2a( 3a – 4b ) –3b (5a + 3b )=

f) –3x( 6x – y) + 4y( 5y – 2x) – 4( 5x + 2y ) ( 3y – 2x) =