Question

Rút gọn các biểu thức:

a) (2\(\sqrt{3}\)+ \(\sqrt{5}\))\(\sqrt{3}\) - \(\sqrt{60}\)

b) (5\(\sqrt{2}\) + 2\(\sqrt{5}\) )\(\sqrt{5}\) - \(\sqrt{250}\)

c) (\(\sqrt{28}\) - \(\sqrt{12}\) - \(\sqrt{7}\))\(\sqrt{7}\) + 2\(\sqrt{21}\)

d) (\(\sqrt{99}\) - \(\sqrt{18}\) - \(\sqrt{11}\) )\(\sqrt{11}\)+3\(\sqrt{22}\)

Answer 1

\(2.3+\sqrt{15}-2\sqrt{15}=6-\sqrt{15}\)

\(5\sqrt{10}+2.5-5\sqrt{10}=10\)

\(14-2\sqrt{21}-7+2\sqrt{21}=7\)

\(33-3\sqrt{22}-11+3\sqrt{22}=22\)