Voici mes réponses ai je bon ? 4x - 5 = 9x + 4
4x - 9x = 4 + 5
-5x = 9
x= - 9/5
5x/4 = 21/9
45x/36 = 84/36
45x = 84
x = 84 - 45
x = 39
3 - x = 10x - 7
-x - 10x = -7 - 3
-11x = -10
x = 10/11
1/5 + 3/4x = 8/9 - 6/7x
21/28x + 24/28x = 40/45 - 9/45
21x + 24x = 40 - 9
45x = 49
x = 49/45
(x-7)² = (x+4)²
2x - 49 = 2x + 16
2x - 2x = 16+49
x = 65
le dernier :
??????
4x - 9x = 4 + 5
-5x = 9
x= - 9/5
5x/4 = 21/9
45x/36 = 84/36
45x = 84
x = 84 - 45
x = 39
3 - x = 10x - 7
-x - 10x = -7 - 3
-11x = -10
x = 10/11
1/5 + 3/4x = 8/9 - 6/7x
21/28x + 24/28x = 40/45 - 9/45
21x + 24x = 40 - 9
45x = 49
x = 49/45
(x-7)² = (x+4)²
2x - 49 = 2x + 16
2x - 2x = 16+49
x = 65
le dernier :
??????
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