bonsoir,
A= 15y +21
b= -15 +6x +6x -4x² = -4x² +12x -15
C= 25+7b -6 +4b -20 +21 -7b +8 -11b
= -7b+28
D= 9(1-8y)
E = 2t( 4t -1)
F= 4( 2y +3x)
G= 4( x² -2x +7)
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bonsoir,
A= 15y +21
b= -15 +6x +6x -4x² = -4x² +12x -15
C= 25+7b -6 +4b -20 +21 -7b +8 -11b
= -7b+28
D= 9(1-8y)
E = 2t( 4t -1)
F= 4( 2y +3x)
G= 4( x² -2x +7)