\(\sqrt{75}\)+ \(\sqrt{48}\)+ \(\frac{1}{2}\).\(\sqrt{300}\)
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a) = \(\frac{\sqrt{2}.\sqrt{4+\sqrt{15}}}{\sqrt{2}}+\frac{\sqrt{2}.\sqrt{4-\sqrt{15}}}{\sqrt{2}}\)
= \(\frac{\sqrt{8+2\sqrt{15}}}{\sqrt{2}}+\frac{\sqrt{8-2\sqrt{15}}}{\sqrt{2}}\)
= \(\frac{\sqrt{\left(\sqrt{5}+\sqrt{3}\right)^2}}{\sqrt{2}}+\frac{\sqrt{\left(\sqrt{5}-\sqrt{3}\right)^2}}{\sqrt{2}}\)
= \(\frac{\sqrt{5}+\sqrt{3}}{\sqrt{2}}+\frac{\sqrt{5}-\sqrt{3}}{\sqrt{2}}\)
= \(\frac{2\sqrt{5}}{\sqrt{2}}\)
= \(\sqrt{10}\)
b) = \(5\sqrt{3}+4\sqrt{3}-10\sqrt{3}\)
= \(-\sqrt{3}\)
c) = \(\sqrt{\left(\sqrt{2}-\sqrt{1}\right)^2}+\frac{1\left(\sqrt{2}+1\right)}{2-1}\)
= \(\sqrt{2}-\sqrt{1}+\frac{1\left(\sqrt{2}+1\right)}{1}\)
= \(\sqrt{2}-\sqrt{1}+\sqrt{2}+\sqrt{1}\)
= \(2\sqrt{2}\)
Chúc bạn học tốt ^^
a: \(5\sqrt{2}-8\sqrt{3}+30\sqrt{3}-6\sqrt{3}=5\sqrt{2}+16\sqrt{3}\)
b: \(=14\sqrt{3}-\dfrac{3}{32}\cdot8\sqrt{3}+\dfrac{4}{18}\cdot9\sqrt{3}-\dfrac{1}{10}\cdot10\sqrt{3}\)
\(=14\sqrt{3}-\dfrac{3}{4}\sqrt{3}+2\sqrt{3}-1\sqrt{3}=\dfrac{57}{4}\sqrt{3}\)
c: \(=\dfrac{-1}{2}\cdot6\sqrt{3}+\dfrac{1}{15}\cdot5\sqrt{3}-\dfrac{1}{22}\cdot11\sqrt{3}+2\sqrt{3}\)
\(=-3\sqrt{3}+\dfrac{1}{3}\sqrt{3}-\dfrac{1}{2}\sqrt{3}+2\sqrt{3}=-\dfrac{7}{6}\sqrt{3}\)
d: \(=\dfrac{5}{8}\cdot4\sqrt{3}-\dfrac{1}{33}\cdot11\sqrt{3}+\dfrac{3}{14}\cdot7\sqrt{3}-\dfrac{1}{4}\cdot8\sqrt{3}\)
\(=\dfrac{5}{2}\sqrt{3}-\dfrac{1}{3}\sqrt{3}+\dfrac{3}{2}\sqrt{3}-2\sqrt{3}=\dfrac{5}{3}\sqrt{3}\)
c/\(C=\left(3\sqrt{2}\right)^2-\left(2\sqrt{3}\right)^2\)
\(C=9.2-4.3=6\)
Vũ Minh TuấnMinh AnNgọc HnueBăng Băng 2k6Thảo PhươngLương Minh HằngHồ Bảo TrâmĐỖ CHÍ DŨNGđề bài khó wá
\(=\frac{1}{2}\sqrt{48}-2\sqrt{75}-\frac{\sqrt{33}}{\sqrt{11}}+5\sqrt{1\frac{1}{3}}\)
\(=\frac{1}{2}4\sqrt{3}-2.5\sqrt{3}-\sqrt{3}+\frac{10}{\sqrt{3}}=-9\sqrt{3}+\frac{10}{\sqrt{3}}=\frac{-17\sqrt{3}}{3}\)
\(\left(2\sqrt{300}+3\sqrt{48}-4\sqrt{75}\right):\sqrt{3}\)
\(=\left(20\sqrt{3}+12\sqrt{3}-20\sqrt{3}\right):\sqrt{3}\)
\(=12\sqrt{3}:\sqrt{3}\)
\(=12\)
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\(\frac{1}{2}\sqrt{48}-2\sqrt{75}-\sqrt{54}+5\sqrt{1\frac{1}{3}}\) =\(2\sqrt{3}-10\sqrt{3}-3\sqrt{6}+\frac{10\sqrt{3}}{3}\)
=\(\frac{-24\sqrt{3}-9\sqrt{6}+10\sqrt{3}}{3}=\frac{-14\sqrt{3}-9\sqrt{6}}{3}\)
\(=\frac{1}{2}\sqrt{16.3}-2\sqrt{25.3}-\frac{\sqrt{3.11}}{\sqrt{11}}+5\sqrt{\frac{1.3+1}{3}}\)
\(=\frac{1}{2}\sqrt{4^2.3}-2\sqrt{5^2.3}-\frac{\sqrt{3}.\sqrt{11}}{\sqrt{11}}+5\sqrt{\frac{4}{3}}\)
\(=\frac{1}{2}.4\sqrt{3}-2.5\sqrt{3}-\sqrt{3}+5\frac{\sqrt{4}}{\sqrt{3}}\)
\(=\frac{4}{2}\sqrt{3}-10\sqrt{3}-\sqrt{3}+5\frac{\sqrt{4}.\sqrt{4}}{\sqrt{3.}\sqrt{3}}\)
\(=2\sqrt{3}-10\sqrt{3}-\sqrt{3}+5\frac{2\sqrt{3}}{3}\)
\(=2\sqrt{3}-10\sqrt{3}-\sqrt{3}+10\frac{\sqrt{3}}{3}\)
\(=\left(2-10-1+\frac{10}{3}\right)\sqrt{3}\)
\(=-\frac{17}{3}\)
\(\sqrt{75}+\sqrt{48}+\frac{1}{2}.\sqrt{300}\)
\(=5\sqrt{3}+4\sqrt{3}+5\sqrt{3}\)
\(=\left(5+4+5\right)\sqrt{3}\)
\(=14\sqrt{3}\)