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Matfly
@Matfly
May 2019
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Bonjour à tous
Pouvez vous m'ader à reésoudre ce devoir de math, Merci d'avance .
Dans chaque cas, déterminer la forme développée réduite de l'expression :
A1 = 4x(7x-8)
A2 = 5y(9-7y)
A3 = 4n(7-5n)+7n² +8n-9
A4 = -3x(7x-9)+7x(4-9x)
A5 = 4x² -7x+9+(7x² -9x+8)-(-3x² -8x-12)
A6 = -4x² -7x+9-(9x² -7x+25)
A7 = 7x(9x-5)-3x(-4x+9)-4x² -5x+9
A8 = -(3x-5)+4(3x² -7x+9)-(7x² -12x-15)
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calinizou
Verified answer
Bonsoir
a1= 4x(7x-8)=28x²-32x
a2=5y(9-7y)=45y-35y²
a3=4n(7-5n)+7n²+8n-9=28n-20n²+7n²+8n-9=-13n²+36n-9
a4=-3x(7x-9)+7x(4-9x)=-21x²+27x+28x-63x²=-84x²+55x
a5=4x²-7x+9+(7x²-9x+8)-(-3x²-8x-12)=4x²-7x+9+7x²-9x+8+3x²+8x+12=14x²-8x+29
a6=-4x²-7x+9-(9x²-7x+25)=-4x²-7x+9-9x²+7x-25=-13x²-16
a7=7x(9x-5)-3x(-4x+9)-4x²-5x+9=63x²-35x+12x²-27x-4x²-5x+9=71x²-67x+9
a8=-(3x-5)+4(3x²-7x+9)-(7x²-12x-15)=-3x+5+12x²-28x+36-7x²+12x+15=5x²-19x+56
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Verified answer
Bonsoira1= 4x(7x-8)=28x²-32x
a2=5y(9-7y)=45y-35y²
a3=4n(7-5n)+7n²+8n-9=28n-20n²+7n²+8n-9=-13n²+36n-9
a4=-3x(7x-9)+7x(4-9x)=-21x²+27x+28x-63x²=-84x²+55x
a5=4x²-7x+9+(7x²-9x+8)-(-3x²-8x-12)=4x²-7x+9+7x²-9x+8+3x²+8x+12=14x²-8x+29
a6=-4x²-7x+9-(9x²-7x+25)=-4x²-7x+9-9x²+7x-25=-13x²-16
a7=7x(9x-5)-3x(-4x+9)-4x²-5x+9=63x²-35x+12x²-27x-4x²-5x+9=71x²-67x+9
a8=-(3x-5)+4(3x²-7x+9)-(7x²-12x-15)=-3x+5+12x²-28x+36-7x²+12x+15=5x²-19x+56