January 2021 0 64 Report
Bonsoir, je suis en 4ème svp aidez moi pour: a) tester chaque résultat en prenant x=1. b)réduire l'expression B-C.
c)réduire l'expression A-B+C-D.
"=au carré
A=-7(x-2)
=-7×x-7×(-2)
=-7x-14.
B=(-4x+5)(x+3)
=4x×x+4x×3+5×x+5×3
=4x"+12x+5x+15
=4x"+17x+15.
C=(9+x)(3x-1)
=9×3x+9×(-1)+x×3x+x×(-1)
=27x×-9+3x"-x
=3x"+27x-x-9
=3x"+26x-9.
D=(6x-2)(5x-3)
=6x×5x+6x×(-3)-2×5x-2×(-3)
=30x"-18x-10x+6.
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