Ôn tập chương 1: Căn bậc hai. Căn bậc ba
Các câu hỏi tương tự
Tính A=\(\frac{\sqrt{3}}{2}+\frac{\sqrt{5}}{4}+\frac{\sqrt{7}}{6}+...+\frac{\sqrt{81}}{80}\)
Tính B=\(\frac{\sqrt{1}}{2}+\frac{\sqrt{3}}{4}+\frac{\sqrt{5}}{6}+...+\frac{\sqrt{79}}{80}\)
Tính \(\frac{2\sqrt{3}-4}{\sqrt{3}-1}+\frac{2\sqrt{2}-1}{\sqrt{2}-1}-\frac{1+\sqrt{6}}{\sqrt{2}+3}\)
\(C=\sqrt{4+\sqrt{5\sqrt{3}+5\sqrt{48-10\sqrt{7+4\sqrt{3}}}}}\)
rút gọn biểu thức
a) \(\frac{5+\sqrt{5}}{5-\sqrt{5}}+\frac{5-\sqrt{5}}{5+\sqrt{5}}\)
b) \(\frac{3}{2+\sqrt{3}}+\frac{13}{4-\sqrt{3}}+\frac{6}{\sqrt{3}}\)
c) \(\left(\frac{\sqrt{14}-\sqrt{7}}{\sqrt{2}-1}+\frac{\sqrt{15}-\sqrt{5}}{\sqrt{3}-1}\right):\frac{1}{\sqrt{7}-\sqrt{5}}\)
Tính giá trị của biểu thức:
a) A=\(\frac{\sqrt{3+\sqrt{5}}}{\sqrt{2}}-\frac{\sqrt{5}-1}{2}\)
b) B=\(\frac{1}{1+\sqrt{2}}+\frac{1}{\sqrt{2}+\sqrt{3}}+\frac{1}{\sqrt{3}+\sqrt{4}}+...+\frac{1}{\sqrt{99}+\sqrt{100}}\)
1/frac{4sqrt{2}}{2+sqrt{2}}-frac{4sqrt{2}}{2-sqrt{2}}
2/ frac{2}{sqrt{2}}+sqrt{2}-2sqrt{18}+sqrt{left(1-sqrt{2}right)^2}
3/ 9sqrt{frac{2}{3}}+5sqrt{54}-sqrt{frac{1}{2}-frac{1}{3}}
4/ sqrt{4+2sqrt{2}}.sqrt{4-2sqrt{2}}.left(sqrt{8}-sqrt{2}right)
5/ sqrt{14-6sqrt{5}}+sqrt{3-2sqrt{2}}+sqrt{7-2sqrt{10}}
Đọc tiếp
1/\(\frac{4\sqrt{2}}{2+\sqrt{2}}-\frac{4\sqrt{2}}{2-\sqrt{2}}\)
2/ \(\frac{2}{\sqrt{2}}+\sqrt{2}-2\sqrt{18}+\sqrt{\left(1-\sqrt{2}\right)^2}\)
3/ \(9\sqrt{\frac{2}{3}}+5\sqrt{54}-\sqrt{\frac{1}{2}-\frac{1}{3}}\)
4/ \(\sqrt{4+2\sqrt{2}}.\sqrt{4-2\sqrt{2}}.\left(\sqrt{8}-\sqrt{2}\right)\)
5/ \(\sqrt{14-6\sqrt{5}}+\sqrt{3-2\sqrt{2}}+\sqrt{7-2\sqrt{10}}\)
trục căn thức ở mẫu :
a,frac{3}{sqrt{5}};frac{2sqrt{3}}{sqrt{2}};frac{a}{sqrt{b}};frac{x+1}{sqrt{x^2-1}}
b,frac{1}{sqrt{3}+sqrt{2}};frac{2}{2-sqrt{3}};frac{sqrt{2}+1}{sqrt{2}-1};frac{3sqrt{2}}{sqrt{3}+1}
c,frac{1}{1+sqrt{2}+sqrt{3}}
d,frac{1}{sqrt{2sqrt{3}-sqrt{2}}.sqrt{2}.sqrt{sqrt{2}+sqrt{3}}}
Đọc tiếp
trục căn thức ở mẫu :
a,\(\frac{3}{\sqrt{5}};\frac{2\sqrt{3}}{\sqrt{2}};\frac{a}{\sqrt{b}};\frac{x+1}{\sqrt{x^2-1}}\)
b,\(\frac{1}{\sqrt{3}+\sqrt{2}};\frac{2}{2-\sqrt{3}};\frac{\sqrt{2}+1}{\sqrt{2}-1};\frac{3\sqrt{2}}{\sqrt{3}+1}\)
c,\(\frac{1}{1+\sqrt{2}+\sqrt{3}}\)
d,\(\frac{1}{\sqrt{2\sqrt{3}-\sqrt{2}}.\sqrt{2}.\sqrt{\sqrt{2}+\sqrt{3}}}\)
Dạng 1: Thực hiện phép tính, tính giá trị, rút gọn biểu thức số.
Afrac{sqrt{3}}{sqrt{sqrt{3}+1}-1}-frac{sqrt{3}}{sqrt{sqrt{3}+1}+1}
Bsqrt{15-6sqrt{6}}+sqrt{33-12sqrt{6}}
Cfrac{sqrt{3}+sqrt{2}-1}{2+sqrt{6}}+frac{sqrt{2}-sqrt{3}}{sqrt{2}+1}left(frac{sqrt{3}}{2-sqrt{6}}+frac{sqrt{3}}{2+sqrt{6}}right)-frac{1}{sqrt{2}}
Dfrac{15}{sqrt{6}+1}+frac{4}{sqrt{6}-2}+frac{12}{sqrt{6}-3}-sqrt{6}
Eleft(frac{2}{sqrt{3}-1}+frac{3}{sqrt{3}-2}+frac{15}{3-sqrt{3}}right).frac{1}{sqrt{3}+5}
Đọc tiếp
Dạng 1: Thực hiện phép tính, tính giá trị, rút gọn biểu thức số.
\(A=\frac{\sqrt{3}}{\sqrt{\sqrt{3}+1}-1}-\frac{\sqrt{3}}{\sqrt{\sqrt{3}+1}+1}\)
\(B=\sqrt{15-6\sqrt{6}}+\sqrt{33-12\sqrt{6}}\)
\(C=\frac{\sqrt{3}+\sqrt{2}-1}{2+\sqrt{6}}+\frac{\sqrt{2}-\sqrt{3}}{\sqrt{2}+1}\left(\frac{\sqrt{3}}{2-\sqrt{6}}+\frac{\sqrt{3}}{2+\sqrt{6}}\right)-\)\(\frac{1}{\sqrt{2}}\)
\(D=\frac{15}{\sqrt{6}+1}+\frac{4}{\sqrt{6}-2}+\frac{12}{\sqrt{6}-3}-\sqrt{6}\)
\(E=\left(\frac{2}{\sqrt{3}-1}+\frac{3}{\sqrt{3}-2}+\frac{15}{3-\sqrt{3}}\right)\)\(.\frac{1}{\sqrt{3}+5}\)
Thực hiện phép tính:
a, \(\left(\frac{3}{\sqrt{5}-\sqrt{2}}+\frac{4}{\sqrt{6}+\sqrt{2}}\right)\left(\sqrt{3}-1\right)^2\)
b, \(\frac{1}{1+\sqrt{2}}+\frac{1}{\sqrt{2}+\sqrt{3}}+....+\frac{1}{\sqrt{99}+\sqrt{100}}\)
Rút gọn biểu thức :
a,frac{2+sqrt{3}}{2-sqrt{3}};frac{5+2sqrt{6}}{5-2sqrt{6}}
b,frac{sqrt{3}-1}{sqrt{3}+1}
c,frac{2+sqrt{3}}{2-sqrt{3}}+frac{2-sqrt{3}}{2+sqrt{3}}
d,frac{sqrt{2+sqrt{3}}+sqrt{2-sqrt{3}}}{sqrt{2+sqrt{3}}-sqrt{2-sqrt{3}}}-frac{sqrt{2+sqrt{3}}-sqrt{2-sqrt{3}}}{sqrt{2+sqrt{3}}+sqrt{2-sqrt{3}}}
Đọc tiếp
Rút gọn biểu thức :
a,\(\frac{2+\sqrt{3}}{2-\sqrt{3}};\frac{5+2\sqrt{6}}{5-2\sqrt{6}}\)
b,\(\frac{\sqrt{3}-1}{\sqrt{3}+1}\)
c,\(\frac{2+\sqrt{3}}{2-\sqrt{3}}+\frac{2-\sqrt{3}}{2+\sqrt{3}}\)
d,\(\frac{\sqrt{2+\sqrt{3}}+\sqrt{2-\sqrt{3}}}{\sqrt{2+\sqrt{3}}-\sqrt{2-\sqrt{3}}}-\frac{\sqrt{2+\sqrt{3}}-\sqrt{2-\sqrt{3}}}{\sqrt{2+\sqrt{3}}+\sqrt{2-\sqrt{3}}}\)