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Sagot :
Salut,
(2x-4)(9-3x) = 0
2x - 4 = 0 <=> 2x = 4 <=> x = 2
9 -3x = 0 <=> -3x = -9 <=> x = 3
S = {2;3}
(3x+1)(1+3x) = 0
3x + 1 = 0 <=> 3x = -1 <=> x = -1/3
1 + 3x = 0 <=> 3x = -1 <=> x = -1/3
S = {-1/3}
7x(1-2x) = 0
7x = 0 <=> x = 0
1-2x = 0 <=> -2x = -1 <=> x = 1/2
S = {-1/2;0}
(5x-10)(8-4x) = 0
5x - 10 = 0 <=> 5x = 10 <=> x = 2
8 - 4x = 0 <=> - 4x = -8 <=> x = 2
S = {2}
Bonne soirée !
(2x-4)(9-3x) = 0
2x - 4 = 0 <=> 2x = 4 <=> x = 2
9 -3x = 0 <=> -3x = -9 <=> x = 3
S = {2;3}
(3x+1)(1+3x) = 0
3x + 1 = 0 <=> 3x = -1 <=> x = -1/3
1 + 3x = 0 <=> 3x = -1 <=> x = -1/3
S = {-1/3}
7x(1-2x) = 0
7x = 0 <=> x = 0
1-2x = 0 <=> -2x = -1 <=> x = 1/2
S = {-1/2;0}
(5x-10)(8-4x) = 0
5x - 10 = 0 <=> 5x = 10 <=> x = 2
8 - 4x = 0 <=> - 4x = -8 <=> x = 2
S = {2}
Bonne soirée !
2x-4 =0 9-3x
2x = 4 -3x = -9
x = 4/2 x = -9/3
x = 2 x = -3
solution (2, -3)
3x +1 =0 1+3x =0
3x = -1 3x = -1
x = -1/3 x = -1/3
donc une solution -1/3
7x =0 1-2x =0
x = 0/7 -2x = -1
x = 0 x = -1/-2 = 1/2
donc solution (0, 1/2)
5x-10 = 0 8-4x = 0
5x = 10 -4x = -8
x = 10/5 x = -8/-4
x = 2 x = 2
une seule solution 2
2x = 4 -3x = -9
x = 4/2 x = -9/3
x = 2 x = -3
solution (2, -3)
3x +1 =0 1+3x =0
3x = -1 3x = -1
x = -1/3 x = -1/3
donc une solution -1/3
7x =0 1-2x =0
x = 0/7 -2x = -1
x = 0 x = -1/-2 = 1/2
donc solution (0, 1/2)
5x-10 = 0 8-4x = 0
5x = 10 -4x = -8
x = 10/5 x = -8/-4
x = 2 x = 2
une seule solution 2
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