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bonjour
a) 3 x - 4 = 15 ( x - 1)
3 x - 4 = 15 x - 15
3 x - 15 x = - 15 + 4
- 12 x = - 11
x = 11/12
b) 5 x - 3 = 6 x + 1
5 x - 6 x = 1 + 3
- x = 4
x = - 4
c) - 2 ( 5 x - 3) = x - 12
- 10 x + 6 = x - 12
- 10 x - x = - 12 - 6
- 11 x = - 18
x = 18/11
d) x - 5/7 = 1/5 + 2 x
35 x /35 - 25/35 = 7/35 + 70 x /35
35 x - 70 x = 7 + 25
- 35 x = 32
x = - 32/35
a) 3 x - 4 = 15 ( x - 1)
3 x - 4 = 15 x - 15
3 x - 15 x = - 15 + 4
- 12 x = - 11
x = 11/12
b) 5 x - 3 = 6 x + 1
5 x - 6 x = 1 + 3
- x = 4
x = - 4
c) - 2 ( 5 x - 3) = x - 12
- 10 x + 6 = x - 12
- 10 x - x = - 12 - 6
- 11 x = - 18
x = 18/11
d) x - 5/7 = 1/5 + 2 x
35 x /35 - 25/35 = 7/35 + 70 x /35
35 x - 70 x = 7 + 25
- 35 x = 32
x = - 32/35
Bonjour et bonne année 2018 !
a) 3x - 4 = 15(x - 1)
3x - 4 = 15 * x + 15 * -1
3x - 4 = 15x - 15
3x - 15x = -15 + 4
-12x = -11
x = -11/-12
x = 11/12
b) 5x - 3 = 6x + 1
5x - 6x = 1 + 3
-x = 4
x = -4
c) -2(5x - 3) = x - 12
-2 * 5x - 2 * - 3 = x - 12
-10x + 6 = x - 12
-10x - x = -12 - 6
-11x = -18
x = -18/-11
x = 18/11
d) x - 5/7 = 1/5 + 2x
x - 2x = 1/5 + 5/7
-x = 7/35 + 25/35
-x = 32/35
x = -32/35
a) 3x - 4 = 15(x - 1)
3x - 4 = 15 * x + 15 * -1
3x - 4 = 15x - 15
3x - 15x = -15 + 4
-12x = -11
x = -11/-12
x = 11/12
b) 5x - 3 = 6x + 1
5x - 6x = 1 + 3
-x = 4
x = -4
c) -2(5x - 3) = x - 12
-2 * 5x - 2 * - 3 = x - 12
-10x + 6 = x - 12
-10x - x = -12 - 6
-11x = -18
x = -18/-11
x = 18/11
d) x - 5/7 = 1/5 + 2x
x - 2x = 1/5 + 5/7
-x = 7/35 + 25/35
-x = 32/35
x = -32/35
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