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Lauradu64
@Lauradu64
April 2019
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Bonjour pouvez vous m'aidez svp,c'est un devoir maison,merci encore
1.Développer,puis réduire les expressions suivantes:
A=(3x+1)(2x-1)+4x(1-3x)
B=2x(2x-1)+(1-3x)(6x+1)
Merci a tous,bonne journée.
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Lou974
Bonjour,
A = (3x+1)(2x-1) + 4x(1-3x)
A = 3x*2x + 3x *(-1) + 1*2x +1*(-1) + 4x*1 +4x*(-3x)
A = 6x² -3x +2x -1 + 4x - 12x²
A = 6x² -12x² -3x +2x +4x -1
A = -(6x)² +3x -1
B = 2x(2x-1) + (1-3x)(6x+1)
B = 2x*2x + 2x*(-1) + 1*6x + 1*1 -3x*6x -3x *1
B = 4x² -2x + 6x + 1 -18x² -3x
B = 4x² -18x² -2x +6x -3x +1
B = (-14x)² + x + 1
Voilà.
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A = (3x+1)(2x-1) + 4x(1-3x)
A = 3x*2x + 3x *(-1) + 1*2x +1*(-1) + 4x*1 +4x*(-3x)
A = 6x² -3x +2x -1 + 4x - 12x²
A = 6x² -12x² -3x +2x +4x -1
A = -(6x)² +3x -1
B = 2x(2x-1) + (1-3x)(6x+1)
B = 2x*2x + 2x*(-1) + 1*6x + 1*1 -3x*6x -3x *1
B = 4x² -2x + 6x + 1 -18x² -3x
B = 4x² -18x² -2x +6x -3x +1
B = (-14x)² + x + 1
Voilà.