\(\sqrt{\frac{9}{25}}+\sqrt{\frac{1}{6}}-\sqrt{\frac{4}{49}}=?\)
nhờ giải cách làm rõ ra cho mik mình tik cho
\(\frac{\left(5+\sqrt{24}\right)\cdot\left(49-20\sqrt{6}\right)\cdot\sqrt{5-2\sqrt{6}}}{9\sqrt{30}-11\sqrt{2}}\)
Tính ghi rõ cách giải
\(\frac{\left(5+\sqrt{24}\right)\left(49-20\sqrt{6}\right).\sqrt{5-2\sqrt{6}}}{9\sqrt{30}-11\sqrt{2}}=\frac{\left(5+2\sqrt{6}\right)\left(5-2\sqrt{6}\right)^2.\sqrt{5-2\sqrt{6}}}{9\sqrt{30}-11\sqrt{2}}\)
\(=\frac{\left(5+2\sqrt{6}\right)\left(5-2\sqrt{6}\right)\left(5-2\sqrt{6}\right)\sqrt{5-2\sqrt{6}}}{9\sqrt{30}-11\sqrt{2}}\)
\(=\frac{\left(25-24\right)\left(\sqrt{3}-\sqrt{2}\right)^2.\left(\sqrt{3}-\sqrt{2}\right)}{9\sqrt{30}-11\sqrt{2}}\)\(=\frac{\left(\sqrt{3}-\sqrt{2}\right)^3}{9\sqrt{30}-11\sqrt{2}}\)
Đến đây k biết làm
Tính:
a)\(\frac{2}{3}\)+\(\sqrt{2.25}\).\(\sqrt{1\frac{11}{25}}\)-\(\frac{1}{5}\)
b)\(\left(\frac{-1}{3}\right)^2\).\(\frac{27}{2}\)-\(\frac{5}{5^2}\):\(\sqrt{\frac{25}{36}}\)
c)\(\frac{1}{2}.\sqrt{1,24}.\sqrt{1\frac{9}{16}}+\frac{1}{4}\)
Mí bạn làm nhớ ghi rõ cách nhé. Ghi rõ mik cho 3 tick lun. Ghi kết quả không tick đâu nghen.
a)= \(\frac{2}{3}+\frac{3}{2}.\frac{6}{5}-\frac{1}{5}\)
=\(\frac{13}{6}.1\)=\(\frac{13}{6}\)
b)= \(\frac{1}{9}.\frac{27}{2}-\frac{1}{5}:\frac{5}{6}\)
=\(\frac{3}{2}-\frac{6}{25}=\frac{63}{50}\)
Tính:\(\left(-\frac{1}{3}+\frac{5}{6}\right)^2-\frac{-\sqrt{25^2}-\sqrt{49^2}}{\sqrt{36^2+\sqrt{38^2}}}\)
Nhớ giải cho thật kĩ!!
A = \(\sqrt{\frac{1}{9}+\frac{1}{16}}\)
B = \(\sqrt{4+36+81}\)
C = \(\sqrt{1^{3^{ }}+}2^3\)
E = \(\left(\sqrt{\frac{1}{9}+\sqrt{\frac{25}{36}-\sqrt{\frac{49}{81}}:}\sqrt{\frac{441}{324}}}\right)\)
F = \(-4.\sqrt{\frac{1}{16}+3.\sqrt{\frac{1}{9}}-}5.\sqrt{0,04}\)
Mg các bạn giúp mik ạ
Cảm ơn ạ
\(\sqrt{\frac{1}{9}+\frac{1}{16}}\)
\(=\frac{1}{3}+\frac{1}{4}\)
\(=\frac{7}{12}\)
\(\sqrt{4+36+81}\)
\(=\sqrt{121}\)
\(=\pm11\)
\(\sqrt{1^3}+2^3\)
\(=\sqrt{1}+8\)
\(=1+8\)
\(=9\)
Rút Gọn
a,\(\sqrt{75}-\sqrt{5\frac{1}{3}}+\frac{9}{2}\sqrt{2\frac{2}{3}}+2\sqrt{27}\)
b,\(\sqrt{48}+\sqrt{5\frac{1}{3}}+2\sqrt{75}-5\sqrt{1\frac{1}{3}}\)
c,\(\left(\sqrt{12}+2\sqrt{27}\right)\frac{\sqrt{3}}{2}-\sqrt{150}\)
d,\(\left(\sqrt{18}+\sqrt{0,5}-3\sqrt{\frac{1}{3}}\right)-\left(\sqrt{\frac{1}{8}-\sqrt{75}}\right)\)
e,\(6\sqrt{\frac{8}{9}}-5\sqrt{\frac{32}{25}}+14\sqrt{\frac{18}{49}}\)
f,\(2\sqrt{\frac{16}{3}}-3\sqrt{\frac{1}{27}}-6\sqrt{\frac{4}{75}}\)
g,\(\left(2\sqrt{\frac{16}{3}}-3\sqrt{\frac{1}{27}}-6\sqrt{\frac{4}{75}}\right)\sqrt{3}\)
h,\(\left(6\sqrt{\frac{8}{9}}-5\sqrt{\frac{32}{25}}+14\sqrt{\frac{18}{49}}\right)\sqrt{\frac{1}{2}}\)
i,\(\frac{1}{2}\sqrt{48}-2\sqrt{75}-\frac{\sqrt{33}}{\sqrt{11}}+5\sqrt{1\frac{1}{3}}\)
j,\(\left(\sqrt{\frac{1}{7}}-\sqrt{\frac{16}{7}}+7\right):\sqrt{7}\)
LÀM NHANH , ĐÚNG TỚ TẶNG TICK NEK ^^
1, Trục và rút gọn ( t làm đc 1 nửa r nên chỉ cần các b làm tiếp giùm mik )
a) \(\frac{2\sqrt{10}-5}{9-\sqrt{10}}=\frac{\left(2\sqrt{10}-5\right).\left(9+\sqrt{10}\right)}{81-10}=\frac{...}{71}\)
b) \(\frac{9-2\sqrt{3}}{3\sqrt{6}-2\sqrt{2}}=\frac{\left(9-2\sqrt{3}\right).\left(3\sqrt{6}+2\sqrt{2}\right)}{54-8}=\frac{...}{46}\)
Các b làm giúp t phần ... nha , ko thì có cách khác nhanh hơn thì giải giúp mik ^^
a) nhân ra thôi b
\(=\frac{\left(2\sqrt{10}-5\right)\left(9+\sqrt{10}\right)}{71}=\frac{18\sqrt{10}-45+20-5\sqrt{10}}{71}=\frac{-25+13\sqrt{10}}{71}.\)
b)cách khác nhé !\(\frac{9-2\sqrt{3}}{3\sqrt{6}-2\sqrt{2}}=\frac{\sqrt{3}\left(3\sqrt{3}-2\right)}{\sqrt{2}\left(3\sqrt{3}-2\right)}=\frac{\sqrt{3}}{\sqrt{2}}=\frac{\sqrt{6}}{2}.\)
TÍNH:
\(C=\frac{1}{3\sqrt{1}+1\sqrt{3}}+\frac{1}{5\sqrt{3}+3\sqrt{5}}+....+\frac{1}{119\sqrt{121}+121\sqrt{119}}\)
AI LÀM CHI TIẾT CÁCH GIẢI RA CHO MÌNH VỚI, MÌNH ĐANG CẦN GẤP!!!!!(THEO CHỨNG MINH DẠNG TỔNG QUÁT RỒI LÀM)
Xét: \(\frac{1}{n\sqrt{n-2}+\left(n-2\right)\sqrt{n}}=\frac{1}{\left(\sqrt{n}-\sqrt{n-2}\right)\sqrt{n\left(n-2\right)}}\)
\(=\frac{\sqrt{n}+\sqrt{n-2}}{2\sqrt{n\left(n-2\right)}}=\frac{1}{2}\left(\frac{\sqrt{n}+\sqrt{n-2}}{\sqrt{n\left(n-2\right)}}\right)\)
\(=\frac{1}{2}\left(\frac{1}{\sqrt{n-2}}-\frac{1}{\sqrt{n}}\right)\)
Từ đó ta thay vào:
\(C=\frac{1}{2}\cdot\left(1-\frac{1}{\sqrt{3}}+\frac{1}{\sqrt{3}}-\frac{1}{\sqrt{5}}+...+\frac{1}{\sqrt{199}}-\frac{1}{\sqrt{121}}\right)\)
\(C=\frac{1}{2}\cdot\left(1-\frac{1}{11}\right)\)
\(C=\frac{1}{2}\cdot\frac{10}{11}=\frac{5}{11}\)
Vậy C = 5/11
\(\frac{\sqrt{49}}{6}< |x-\frac{2}{3}|< \frac{26}{\sqrt{81}}\)
Làm giúp mik vs ai nhanh mik tick cho nha!
\(\frac{\sqrt{49}}{6}< \left|x-\frac{2}{3}\right|< \frac{26}{\sqrt{81}}\)
\(\Rightarrow\frac{7}{6}< \left|x-\frac{2}{3}\right|< \frac{26}{9}\)
\(\Rightarrow\frac{21}{18}< \left|x-\frac{12}{18}\right|< \frac{52}{18}\)
còn lại cậu tự tính nha
\(\frac{\sqrt{49}}{6}< \left|x-\frac{2}{3}\right|< \frac{26}{\sqrt{81}}\)
\(\frac{7}{6}< x-\frac{2}{3}< \frac{26}{9}\)
\(\frac{11}{6}< x< \frac{32}{9}\)
Rút gọn
1,\(2\sqrt{\frac{16}{3}}-3\sqrt{\frac{1}{27}}-6\sqrt{\frac{4}{75}}\)
2,\(\left(2\sqrt{\frac{16}{3}}-3\sqrt{\frac{1}{27}}-6\sqrt{\frac{4}{75}}\right)\sqrt{3}\)
3,\(\left(6\sqrt{\frac{8}{9}}-5\sqrt{\frac{32}{25}}+14\sqrt{\frac{18}{49}}\right)\sqrt{\frac{1}{2}}\)
4,\(\frac{1}{2}\sqrt{48}-2\sqrt{75}-\frac{\sqrt{33}}{\sqrt{11}}+5\sqrt{1\frac{1}{3}}\)
5,\(\left(\sqrt{\frac{1}{7}}-\sqrt{\frac{16}{7}}+\sqrt{7}\right):\sqrt{7}\)