` c) ` ` \sqrt{8} . \sqrt{11} . \sqrt{22} `
` = \sqrt{8.11.22} `
` = \sqrt{1936} `
` = 44 `
` d) ` ` \frac{\sqrt{50}}{\sqrt{2}} `
` = \sqrt{\frac{50}{2}} `
` = \sqrt{25} `
` = 25 `
` e) ` ` \sqrt{6,8^2 - 3,2^2} `
` = \sqrt{(6,8 - 3,2)(6,8 + 3,2)} `
` = \sqrt{3,6 . 10} `
` = \sqrt{36} `
` = 6 `