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Ambare
@Ambare
April 2019
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S.V.P aidez moi c'est un dm pour demain
Développer puis réduire les expressions suivantes :
a) (x-3)²
b) (5+3x)²
c) (4-x)(4+x)
d) (x-3) (2x+5)
e) (x-4)(2x+5)-(3x+2)(5x-4)
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n5k8
A)(x-3)² = x²-6x+9
b)(5+3x)²=25+30x+9x²
c)(4-x)(4+x)=4²-x²=16-x²
d)(x-3)(2x+5)=2x²+5x-6x-15=2x²-x-15
e)(x-4)(2x+5)-(3x+2)(5x-4)=2x²+5x-8x-20-(15x²-12x+10x-8)=2x²+5x-8x-20-15x²+12x-10x+8
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b)(5+3x)²=25+30x+9x²
c)(4-x)(4+x)=4²-x²=16-x²
d)(x-3)(2x+5)=2x²+5x-6x-15=2x²-x-15
e)(x-4)(2x+5)-(3x+2)(5x-4)=2x²+5x-8x-20-(15x²-12x+10x-8)=2x²+5x-8x-20-15x²+12x-10x+8