Bonjour,
3a+1=4a Verif:3×1+1=4×1
3a-4a=-1
-a=-1
a=1
(a+b)2=a2+b2 Verif: (0+0)2=0 2+0 2
a2+2ab+b2=a2+b2
a2+2ab+b2-a2-b2=0
2ab=0
ab=0
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Bonjour,
3a+1=4a Verif:3×1+1=4×1
3a-4a=-1
-a=-1
a=1
(a+b)2=a2+b2 Verif: (0+0)2=0 2+0 2
a2+2ab+b2=a2+b2
a2+2ab+b2-a2-b2=0
2ab=0
ab=0