Question

Tính D= |sqrt(8)-3|+|sqrt(19)-4|-(sqrt(19)-sqrt(8))

Answer 1

Sqrt ở đây làm căn bậc hai nhé

Answer 2

\(D=\left|\sqrt{8}-3\right|+\left|\sqrt{19}-4\right|-\left(\sqrt{19}-\sqrt{8}\right)\)

\(D=\left(3-2\sqrt{2}\right)+\sqrt{19}-4-\left(\sqrt{19}-\sqrt{8}\right)\)

\(D=\left(3-2\sqrt{2}\right)+\sqrt{19}-4-\left(\sqrt{19}-2\sqrt{2}\right)\)

\(D=-2\sqrt{2}+3+\sqrt{19}-4-\left(\sqrt{19}-2\sqrt{2}\right)\)

\(D=-2\sqrt{2}+3+\sqrt{19}-4-\sqrt{19}+2\sqrt{2}\)

\(D=-2\sqrt{2}+3-4+2\sqrt{2}\)

\(D=3-4\)

\(D=-1\)