Sagot :
a)3x-5=0
3x=0+5
3x=5
x=5/3
b)8+10x=0
10x=0-8
10x=-8
x=-8/10=-4/5
c)-5-12x=0
-12x=0+5
-12x=5
x=-5/12
d)-7x+14=0
-7x=0-14
-7x=-14
x=-14/-7=14/7=2
e) 4(2x+3)=18
4×2x+4×3=18
8x+12=18
8x=18-12
8x=6
x=6/8=3/4
f) 5x-3=-10x+27
5x+10x=27+3
15x=30
x=30/15=2
g) 5(3x-5)=6x+8
5×3x-5×5=6x+8
15x-25=6x+8
15x-6x=8+25
9x=33
x=33/9=11/3
J'espère que je ne me suis pas trompé sinon voilà !
Réponse :
a) 3x - 5 = 0
3x = 5
x = 5/3
b. 8 + 10x = 0
10x = -8
x = -8/10 = (2*-4)/(2*5) = -4/4
c) -5 - 12x = 0
-12x = 5
x = 5/-12
d) -7x + 14 = 0
-7x = -14
x = 14/7 = 2
e) 4(2x + 3) = 18
8x + 12 = 18
8x = 18 - 12 = 6
x = 6/8 = (2*3)/(2*4) = 3/4
f) 5x - 3 = -10x + 27
5x + 10x = 27 + 3
15x = 30
x = 30/15 = 2
g) 5(3x - 5) = 6x + 8
15x - 25 = 6x + 8
15x - 6x = 8 + 25
9x = 33
x = 33/9 = (3*11)/(3*3) = 11/3
Explications étape par étape