Dans chacun des cas, trouver a.
A) a+5=7
B) a+12=15
C) 3+a=5
D) 4=12-a
E) 3=-10-a
F)a-5=2
A) a+5=7
B) a+12=15
C) 3+a=5
D) 4=12-a
E) 3=-10-a
F)a-5=2
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Verified answer
A)2B)3
C)2
D)8
E)-13
F)3
Verified answer
• A) a + 5 = 7••••a = 7 - 5
••••a = 2••••
• B) a + 12 = 15
••••a = 15 - 12
••••a = 3••••
• C) 3 + a = 5
••••a = 5 - 3
••••a = 2••••
• D) 4 = 12 - a
••••-12 + 4 = -a
••••-8 = -a
••••a = 8••••
• E) 3 = -10 - a
••••10 + 3 = -a
••••13 = -a
••••a = -13••••
• F) a - 5 = 2
••••a = 2 + 5
••••a = 7••••