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I need help with the problems in the picture added.

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Sagot :

[tex]\\ \bull\tt\longmapsto \sqrt{7}+\sqrt{7}=2\sqrt{7}[/tex]

[tex]\\ \bull\tt\longmapsto 6\sqrt{7}-11\sqrt{7}+2\sqrt{7}=-3\sqrt{7}[/tex]

[tex]\\ \bull\tt\longmapsto \sqrt{96}+6\sqrt{72}=4\sqrt{6}+6\sqrt{72}[/tex]

[tex]\\ \bull\tt\longmapsto \sqrt{B}-5\sqrt{B}=-4\sqrt{B}[/tex]

[tex]\\ \bull\tt\longmapsto -2\sqrt{32}-7\sqrt{8}=-4\sqrt{8}-7\sqrt{8}=-11\sqrt{8}[/tex]