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Oceanee9744
@Oceanee9744
April 2019
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Besoin d'aide svp:
1) Développer: A= (2x -5)^2 B= (x-4)(5x +3)
2) Réduire au même dénominateur: A=3/x + 1/6 B= 1/x-1 + 2/x+2
3) Résoudre les équations: (E1): 3x^2-5x=0
(E2): x^2-25=0 (E3): (x-7)^2 -(x-7)(5-2x)+(2x-14)=0
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droopette
1) Développer:
A= (2x -5)²= 4x²-20x+25
B= (x-4)(5x +3)= 5x²+3x-20x-12=5x²-17x-12
2) Réduire au même dénominateur:
A=3/x + 1/6= 3/x+x/6x=18/6x+x/6x=
B= 1/x-1 + 2/x+2=1/x-x/x+2/x+2x/x=
3) Résoudre les équations:
(E1): 3x²-5x=0
x(3x-5)=0
x=0 ou x=5/3
(E2): x²-25=0
x²=25
x=5 ou x= -5
(E3): (x-7)² -(x-7)(5-2x)+(2x-14)=0
x²-14x+49-(5x-2x²-35+14x)+2x-14=0
x²-14x+49-5x+2x²+35-14x+2x-14=0
3x²-31x+70=0
(3x−10)(x−7)=0
x={10/3;7}
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A= (2x -5)²= 4x²-20x+25
B= (x-4)(5x +3)= 5x²+3x-20x-12=5x²-17x-12
2) Réduire au même dénominateur:
A=3/x + 1/6= 3/x+x/6x=18/6x+x/6x=
B= 1/x-1 + 2/x+2=1/x-x/x+2/x+2x/x=
3) Résoudre les équations:
(E1): 3x²-5x=0
x(3x-5)=0
x=0 ou x=5/3
(E2): x²-25=0
x²=25
x=5 ou x= -5
(E3): (x-7)² -(x-7)(5-2x)+(2x-14)=0
x²-14x+49-(5x-2x²-35+14x)+2x-14=0
x²-14x+49-5x+2x²+35-14x+2x-14=0
3x²-31x+70=0
(3x−10)(x−7)=0
x={10/3;7}