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1) justifier que (sqrt(a + b)) ^ 2 = a + b

2) justifier que que (sqrt(a) + sqrt(b)) ^ 2 = a + b + 2sqrt(ab)

3)
En déduire que sqrt(a) + sqrt(b) = sqrt(a + b) si a et E sont tous les deux non nuls.

quelqu'un peux m'aider svp?

Sagot :

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