exercice de dm
Posté : jeu. 30 déc. 2010 19:02
Bonjour ,pouvez vous me dire SVP si les resultats de mes équations sont correcte
0.25x+30=0.75+15
0.25x+30-30=0.75x+15-30
0.25x=0.75x-15
0.25x-0.75x=0.75x-0.75x-15
-0.5x/-0.5=-15/-0.5
x=30.
0.75x+15=0.50x+20
0.75x+15-15=0.50x+20-15
0.75x=0.50x+5
0.75x+0.50x=0.50x-0.50x+5
1.25x/1.25=5/1.25
x=4
0.25x+30=0.50x+20
0.25x+30-30=0.50x+20-30
0.25x=0.50x-10
0.25x-0.50x=0.50x-0.50x-10
-0.25x/-0.25=-10/-0.25
x=40
merci d'avance.
0.25x+30=0.75+15
0.25x+30-30=0.75x+15-30
0.25x=0.75x-15
0.25x-0.75x=0.75x-0.75x-15
-0.5x/-0.5=-15/-0.5
x=30.
0.75x+15=0.50x+20
0.75x+15-15=0.50x+20-15
0.75x=0.50x+5
0.75x+0.50x=0.50x-0.50x+5
1.25x/1.25=5/1.25
x=4
0.25x+30=0.50x+20
0.25x+30-30=0.50x+20-30
0.25x=0.50x-10
0.25x-0.50x=0.50x-0.50x-10
-0.25x/-0.25=-10/-0.25
x=40
merci d'avance.