Bonsoir,
D=
x² +x -( 6x -3 -2x² +x)
= x² +x - 6x +3 +2x² -x
= 3x² -6x +3
E=
9x² -3 -6x² +2x +3x² -6x
= 6x² -4x -3
F=
3y +9x -2xy - 6x² -9x + 2xy
= - 6x² +3y
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Bonsoir,
D=
x² +x -( 6x -3 -2x² +x)
= x² +x - 6x +3 +2x² -x
= 3x² -6x +3
E=
9x² -3 -6x² +2x +3x² -6x
= 6x² -4x -3
F=
3y +9x -2xy - 6x² -9x + 2xy
= - 6x² +3y