Bonsoir,
1) x + 4 = 0
x = - 4
2) 7x - 21 = 0
7x = 21
x = 21/7
x = 3
3) 2x + 3 = 0
2x = - 3
x = - 3/2
4)
3,2y - 1,4 = 5
3,2y = 5 + 1,4
3,2y = 6,4
y = 6,4/3,2
y = 2
5) 2 - 1,2x = 0,2
- 1,2x = 0,2 - 2
- 1,2x = - 1,8
x = 1,8/1,2
x = 1,5.
Réponse :
Explications étape par étape
Bonjour
x + 4 = 0
x + 4 - 4 = 0 - 4
x = -4
7x - 21 = 0
7x - 21 + 21 = 0 + 21
7x/7 = 21/7
2x + 3 = 0
2x + 3 - 3 = 0 - 3
2x = -3
2x/2 = -3/2
x = -3/2
3,2y - 1,4 + 1,4 = 5 + 1,4
3,2y/3,2 = 6,4/3,2
2 - 1,2x = 0,2
2 - 1,2x + 1,2x = 0,2 + 1,2x
2 - 0,2 = 0,2 + 1,2x - 0,2
1,8 = 1,2x
1,8/1,2 = 1,2x/1,2
x = 18/12
x = (3 x 6)/(2 x 6)
x = 3/2
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Verified answer
Bonsoir,
1) x + 4 = 0
x = - 4
2) 7x - 21 = 0
7x = 21
x = 21/7
x = 3
3) 2x + 3 = 0
2x = - 3
x = - 3/2
4)
3,2y - 1,4 = 5
3,2y = 5 + 1,4
3,2y = 6,4
y = 6,4/3,2
y = 2
5) 2 - 1,2x = 0,2
- 1,2x = 0,2 - 2
- 1,2x = - 1,8
x = 1,8/1,2
x = 1,5.
Réponse :
Explications étape par étape
Bonjour
x + 4 = 0
x + 4 - 4 = 0 - 4
x = -4
7x - 21 = 0
7x - 21 + 21 = 0 + 21
7x = 21
7x/7 = 21/7
x = 3
2x + 3 = 0
2x + 3 - 3 = 0 - 3
2x = -3
2x/2 = -3/2
x = -3/2
3,2y - 1,4 = 5
3,2y - 1,4 + 1,4 = 5 + 1,4
3,2y = 6,4
3,2y/3,2 = 6,4/3,2
y = 2
2 - 1,2x = 0,2
2 - 1,2x + 1,2x = 0,2 + 1,2x
2 - 0,2 = 0,2 + 1,2x - 0,2
1,8 = 1,2x
1,8/1,2 = 1,2x/1,2
x = 18/12
x = (3 x 6)/(2 x 6)
x = 3/2