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(a+b+c)(a+b+c)=
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Sagot :

Peterpan1viz
It's the formula!

Sol'tn:
(a+b+c)(a+b+c)
   = (a+b+c)[tex] ^{2} = a^{2} + b ^{2}+ c^{2} +2ab + 2bc+2ac [/tex]

Always remember that ! Or you can use the foil method. :)