Sagot :
Réponse :
1 . 2 ( x - 7 ) = 2 * x + 2 * -7 = 2x -14
3 ( -x + 1 ) = 3 * -x + 3* 1 = -3x +3
2 . 2 (x -7 ) = 3 (-x +1 )
2x - 14 = -3x +3
2x +3x = 3 + 14
5x = 17
5x/5 = 17/5
x = 3.4
7( 6 - 2x ) - 3( 4x+ 1) = 0
42 - 14x - ( 12x + 3 )= 0
42 + 14x -12x - 3 =0
14x -12x = -42 +3
2x= -39
2x/2 = 39/2
x= 19.5
Réponse :
1)
*2(x - 7)= 2x - 14
* 3(-x + 1)= -3x +3
2)
2(x - 7)= 3(-x +1)
2x-14= -3x+3
2x + 3x= 3+14
5x = 17
x= 17/5
* 7(6-2x) -3(4x + 1)= 0
42- 14x -12x -3= 0
-26x + 39 = 0
-26x= -39
x = -39/ -26
x = 39/ 26
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