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Jan974
@Jan974
May 2019
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Pouvez vous m'aider svp
Merci de votre compréhension
Bonne journée
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nadiab
Bonjour,
a) 2x/3-1= -x/2
tu mets au même dénominateur
2*2(x) - 6= 3(-x)
4x+3x= 6
7x= 6
x= 6/7
b) 6-4x=5x-11
-4x-5x=-11-6
-9x= -17
x= -17/-9= 17/9
pareil pour la c, même méthode
d) x/(x-1)= - 1/3
-(x-1)= 3*x
-x+1= 3x
-x+3x= -1
2x= -1
x= -1/2
e) (2x+3)²= (4x+1)(x-5)
tu développes
4x²+6x+6x+9= 4x²+x-20x-5
4x²+12x+9-4x²+19x+5=0
31x+14=0
x= -14/31
f) 3(2-6x) -2(2x-5)= x+11+(5x-2)²-(5x+6)(5x-8)
6-18x-4x+10= x+11+25x²-10x-10x+4-(25x²+30x-40x-48)
6-22x+10= 25x²-19x+15-25x²+10x+48
16-22x-25x²+19x-15+25x²-10x-48=0
- 13x - 47= 0
x= -47/13
g) x+3x > 2+1
4x > 3
x > 3/4
h) 2-5x ≤ 3 -2x+4
-5x+2x ≤ 3+4-2
-3x ≤ 5
x ≥ -5/3
i) 25x²-16x= 0
x(25x-16)= 0
x= 0 ou 25x-16=0
x= 16/25
2 votes
Thanks 1
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Lista de comentários
a) 2x/3-1= -x/2
tu mets au même dénominateur
2*2(x) - 6= 3(-x)
4x+3x= 6
7x= 6
x= 6/7
b) 6-4x=5x-11
-4x-5x=-11-6
-9x= -17
x= -17/-9= 17/9
pareil pour la c, même méthode
d) x/(x-1)= - 1/3
-(x-1)= 3*x
-x+1= 3x
-x+3x= -1
2x= -1
x= -1/2
e) (2x+3)²= (4x+1)(x-5)
tu développes
4x²+6x+6x+9= 4x²+x-20x-5
4x²+12x+9-4x²+19x+5=0
31x+14=0
x= -14/31
f) 3(2-6x) -2(2x-5)= x+11+(5x-2)²-(5x+6)(5x-8)
6-18x-4x+10= x+11+25x²-10x-10x+4-(25x²+30x-40x-48)
6-22x+10= 25x²-19x+15-25x²+10x+48
16-22x-25x²+19x-15+25x²-10x-48=0
- 13x - 47= 0
x= -47/13
g) x+3x > 2+1
4x > 3
x > 3/4
h) 2-5x ≤ 3 -2x+4
-5x+2x ≤ 3+4-2
-3x ≤ 5
x ≥ -5/3
i) 25x²-16x= 0
x(25x-16)= 0
x= 0 ou 25x-16=0
x= 16/25