Bonjour,
a) si 3x - 5 = 7, alors :
• 3x = 7 + 5 = 12
• x = 12/3 = 4
b) si 2x = 9, alors :
• x = 9/2 = 4,5
c) si -8 = 2t - 4, alors :
• 2t = -8 + 4 = -4
• t = -4/2 = -2
Bonne journée !
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Bonjour,
a) si 3x - 5 = 7, alors :
• 3x = 7 + 5 = 12
• x = 12/3 = 4
b) si 2x = 9, alors :
• x = 9/2 = 4,5
c) si -8 = 2t - 4, alors :
• 2t = -8 + 4 = -4
• t = -4/2 = -2
Bonne journée !