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Sagot :

pk tu t appeller comme ca mddr !
a=5 et b=2
1) a^2 + 2ab + b^2 = 25 + 20 + 4 = 49
a^2 - 2ab + b^2 = 25 - 20 + 4 = 9
a^2 - b^2 = 25 - 4 = 21
2) (a+b)^2 = a^2 + 2ab + b^2 = 49
(a-b)^2 = a^2 - 2ab + b^2 = 9
(a-b)(a+b) = a^2 - b^2 = 21

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