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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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