Bonjour,s'il vous plait j'ai un exercice du maths pour demain.

1. Calculer la somme du B
B=
[tex] \frac{1}{1 + \sqrt{2} } + \frac{1}{ \sqrt{3} + \sqrt{4} } + \frac{1}{ \sqrt{5} + \sqrt{6} } + ... + \frac{1}{ \sqrt{2019} + \sqrt{2020} } + \frac{1}{ \sqrt{2021} + \sqrt{2022} } [/tex]

2. Vérifier que
[tex] \frac{a}{b} + \frac{b}{c} + \frac{c}{d} + \frac{d}{a} \geqslant 4[/tex]
Et merci ​
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