bonjour j'aurais besoin d'aide pour développer et réduire
A)3(3x+9)-7(x-1)
B=-(5x²+7)-(3x+7)+(8x²-2)
C=3+5(-2x+1)-(x+3)-2
Exercice 20
1. A=3x(5x-1)-(2x+2)
B=(5x-7)x3-2(4x-9).
C=3(2x-5)+5-(x+2)
A)3(3x+9)-7(x-1)
B=-(5x²+7)-(3x+7)+(8x²-2)
C=3+5(-2x+1)-(x+3)-2
Exercice 20
1. A=3x(5x-1)-(2x+2)
B=(5x-7)x3-2(4x-9).
C=3(2x-5)+5-(x+2)
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Bonjour,
[tex]A= 3(3x+9)-7(x-1)\\A=9x+27-7x+7\\A=2x+34[/tex]
[tex]B=-(5x^2+7)-(3x+7)+(8x^2-2)\\B=-5x^2-7-3x-7+8x^2-2\\B=3x^2-3x-16[/tex]
[tex]C=3+5(-2x+1)-(x+3)-2\\C=3-10x+5-x-3-2\\C=9x+3[/tex]
[tex]A=3x(5x-1)-(2x+2)\\A=15x^2-3x-2x-2\\A=15x^2-5x-2[/tex]
[tex]B=(5x-7)*3-2(4x-9)\\B=15x-21-8x+18\\B=7x-3[/tex]
[tex]C=3(2x-5)+5-(x+2)\\C=6x-15+5-x-2\\C=5x-12[/tex]