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clairemalik24
@clairemalik24
June 2021
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bonjour, j'ai un dm pour demain et je ne comprends pas ces 3 trois calculs, on peut m'aider?
a: (x+1) (4x-3) + (4x-4) (-x+4)
b: (a+3) (-5a+1) + (5a-4) (-2a-2)
c: (3y-6) (-3y+2) + (2y+2) (-4y+2)
merci pour ceux qui m'aident ! :p
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droopette
A: (x+1) (4x-3) + (4x-4) (-x+4)
=4x²-3x+4x-3-4x²+16x+4x-16
=21x-19
b: (a+3) (-5a+1) + (5a-4) (-2a-2)
=-5a²+a-15a+3-10a²-10a+8a+8
=-15a²-17a+11
c: (3y-6) (-3y+2) + (2y+2) (-4y+2)
=-9y²+6y+18y-12-8y²+4y-8y+4
=-17y²+20y-8
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=4x²-3x+4x-3-4x²+16x+4x-16
=21x-19
b: (a+3) (-5a+1) + (5a-4) (-2a-2)
=-5a²+a-15a+3-10a²-10a+8a+8
=-15a²-17a+11
c: (3y-6) (-3y+2) + (2y+2) (-4y+2)
=-9y²+6y+18y-12-8y²+4y-8y+4
=-17y²+20y-8