Résoudre dans R les équations suivantes :
1) x - 7 = 4
2) 2x = 13
3) 9 - x = 5
4) 4/x = 9/5
aidez moi svp c urgent !!
1) x - 7 = 4
2) 2x = 13
3) 9 - x = 5
4) 4/x = 9/5
aidez moi svp c urgent !!
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X-7=4X=7+4=11
2x=13
X=13/2
9-x=5
-x=-9+5=-4
X=4
4/x=9/5
4x5=x x 9
20=9x
X=20/9
1) x - 7 = 4
x = 4 + 7
x = 11
2) 2x = 13
x = 13/2
x = 6,5
3) 9 - x = 5
- x = 5 - 9
- x = - 4
x = 4
4) 4/x = 9/5
20/5x = 9/5
20x = 9
x = 9/20
x = 0,45