bonjour
réponse :
A=x+2-3x+5
A=x-3x+2+5
A=-2x+7
B=-3y+5+2y-5
B=-3y+2y+5-5
B=-3y+2y
B=-y
C=X×3x-9x-2/3×3x-2/3×(-9)
C=3x²-9x-2x+6
C=3x²-11x+6
D=2x²-2-(2x²+3x-10x-15)
D=2x²-2-(2x²-7x-15)
D=2x²-2-2x²+7x+15
D=13+7x
voilà !
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bonjour
réponse :
A=x+2-3x+5
A=x-3x+2+5
A=-2x+7
B=-3y+5+2y-5
B=-3y+2y+5-5
B=-3y+2y
B=-y
C=X×3x-9x-2/3×3x-2/3×(-9)
C=3x²-9x-2x+6
C=3x²-11x+6
D=2x²-2-(2x²+3x-10x-15)
D=2x²-2-(2x²-7x-15)
D=2x²-2-2x²+7x+15
D=13+7x
voilà !