Sagot :
Réponse :
bonsoir
(3x-5)(x-7)=0
3x-5=0
3x=5
x=5/3
x-7=0
x=7
solution 5/3 et 7
(-2x+11)(6x-9)=0
-2x+11=0
-2x=-11
x=11/2
6x-9=0
6x=9
x=9/6=3/2
solution 11/2 et 3/2
(4-3x)(5x-7)=0
4-3x=0
-3x=-4
x=4/3
5x-7=0
5x=7
x=7/5
solution 4/3 et 7/5
(-6x+11)(8-7x)=0
-6x+11=0
-6x=-11
x=11/6
8-7x=0
-7x=-8
x=8/7
solution 11/6 et 8/7
Explications étape par étape
bonsoir
a.(3 x - 5) * ( x - 7) = 0
soit 3 x - 5 ⇔ 3 x = 5 ⇔ x = 5/3
soit x - 7 = 0 et x = 7
b. ( - 2x + 11 ) * (6x - 9) = 0
-2 x + 11 ⇔ - 2 x = -11 ⇔ x = 11/2
ou x = 9/6 = 3/2
c.(4 - 3x) * (5x - 7) = 0
4 -3 x = 0 ⇔ - 3 x = - 4 ⇔ x = 4/3
ou x = 7/5
d. (- 6x + 11) * (8 - 7x) = 0
- 6 x + 11 ⇔ - 6 x = -11 ⇔ x = -11/6
8 - 7 x = 0 ⇔ - 7 x = -8 ⇔ x = 8/7