Calculer  et donner chque résultat sous la forme aVb ( a et b entiers, b le plus petit possible ) C = V8xV50xV18 D = V8+V50-V18 On pourait m'aidez ? Merci.

Bonsoir,

C = V8xV50xV18

[tex]C = \sqrt{8}\times\sqrt{50}\times\sqrt{18}\\\\C = \sqrt{4\times2}\times\sqrt{25\times2}\times\sqrt{9\times2}\\\\C = \sqrt{4}\times\sqrt{2}\times\sqrt{25}\times\sqrt{2}\times\sqrt{9}\times\sqrt{2}\\\\C =}2\times\sqrt{2}\times5\times\sqrt{2}\times3\times\sqrt{2} \\\\C = 30\times\sqrt{2}\times\sqrt{2}\times\sqrt{2} \\\\C = 30\times(\sqrt{2})^2\times\sqrt{2}\\\\C = 30\times2\times\sqrt{2}\\\\C = 60\sqrt{2}[/tex]


D = V8+V50-V18

[tex]D = \sqrt{8}+\sqrt{50}-\sqrt{18}\\\\D = \sqrt{4\times2}+\sqrt{25\times2}-\sqrt{9\times2}\\\\D = \sqrt{4}\times\sqrt{2}+\sqrt{25}\times\sqrt{2}-\sqrt{9}\times\sqrt{2}\\\\D = 2\sqrt{2}+5\sqrt{2}-3\sqrt{2}\\\\D = 4\sqrt{2}[/tex]