Bài 6: Biến đối đơn giản biểu thức chứa căn bậc hai
Các câu hỏi tương tự
Tính giá trị biểu thức:
a,frac{2}{sqrt{6}-2}+frac{2}{sqrt{6}+2}+frac{5}{sqrt{6}}
b,frac{1}{sqrt{3}+sqrt{2}-sqrt{5}}-frac{1}{sqrt{3}+sqrt{2}+sqrt{5}}
c,left(frac{sqrt{6}-sqrt{2}}{1-sqrt{3}}-frac{5}{sqrt{5}}right):frac{1}{sqrt{5}-sqrt{2}}
d,frac{1}{sqrt{3}}+frac{1}{3sqrt{2}}+frac{1}{sqrt{3}}sqrt{frac{5}{12}-frac{1}{sqrt{6}}}
Đọc tiếp
Tính giá trị biểu thức:
\(a,\frac{2}{\sqrt{6}-2}+\frac{2}{\sqrt{6}+2}+\frac{5}{\sqrt{6}}\)
\(b,\frac{1}{\sqrt{3}+\sqrt{2}-\sqrt{5}}-\frac{1}{\sqrt{3}+\sqrt{2}+\sqrt{5}}\)
\(c,\left(\frac{\sqrt{6}-\sqrt{2}}{1-\sqrt{3}}-\frac{5}{\sqrt{5}}\right):\frac{1}{\sqrt{5}-\sqrt{2}}\)
\(d,\frac{1}{\sqrt{3}}+\frac{1}{3\sqrt{2}}+\frac{1}{\sqrt{3}}\sqrt{\frac{5}{12}-\frac{1}{\sqrt{6}}}\)
1.Rút gọn:
a.\(2\sqrt{3x}-\sqrt{48x}+\sqrt{108x}+\sqrt{3x}\)
b.\(2\sqrt{25xy}+\sqrt{5}\sqrt{45x^3y^3}-3y\sqrt{16x^3y}\)
c.\(\frac{2}{\sqrt{3}-1}+\frac{3}{\sqrt{3}-2}+\frac{12}{3-\sqrt{3}}\)
d.\(\frac{1}{\sqrt[]{3}-\sqrt{2}}-\frac{2}{\sqrt{3}+\sqrt{5}}-\frac{3}{\sqrt{5}-\sqrt{2}}+\frac{4}{\sqrt{7}+\sqrt{3}}\)
1.Rút gọn:
a.\(2\sqrt{3x}-\sqrt{48x}+\sqrt{108x}+\sqrt{3x}\)
b.\(2\sqrt{25xy}+\sqrt{5}\sqrt{45x^3y^3}-3y\sqrt{16x^3y}\)
c.\(\frac{2}{\sqrt{3}-1}+\frac{3}{\sqrt{3}-2}+\frac{12}{3-\sqrt{13}}\)
d.\(\frac{1}{\sqrt{3}-\sqrt{2}}-\frac{2}{\sqrt{3}+\sqrt{5}}-\frac{3}{\sqrt{5}-\sqrt{2}}+\frac{4}{\sqrt{7}+\sqrt{3}}\)
Tính
A/left(frac{2sqrt{3}-sqrt{6}}{sqrt{8}-2}-frac{sqrt{216}}{3}right).frac{1}{sqrt{6}}
B/ left(frac{sqrt{14}-sqrt{7}}{1-sqrt{2}}+frac{sqrt{15}-sqrt{5}}{1-sqrt{3}}right):frac{1}{sqrt{7}-sqrt{5}}
C/ frac{5}{4-sqrt{11}}+frac{1}{3+sqrt{7}}-frac{6}{sqrt{7}-2}-frac{sqrt{7}-5}{2}
D/ frac{sqrt{5}-sqrt{3}}{sqrt{5}+sqrt{3}}+frac{sqrt{5}+sqrt{3}}{sqrt{5}-sqrt{3}}-frac{sqrt{5}+1}{sqrt{5}-1}
Đọc tiếp
Tính
A/\(\left(\frac{2\sqrt{3}-\sqrt{6}}{\sqrt{8}-2}-\frac{\sqrt{216}}{3}\right).\frac{1}{\sqrt{6}}\)
B/ \(\left(\frac{\sqrt{14}-\sqrt{7}}{1-\sqrt{2}}+\frac{\sqrt{15}-\sqrt{5}}{1-\sqrt{3}}\right):\frac{1}{\sqrt{7}-\sqrt{5}}\)
C/ \(\frac{5}{4-\sqrt{11}}+\frac{1}{3+\sqrt{7}}-\frac{6}{\sqrt{7}-2}-\frac{\sqrt{7}-5}{2}\)
D/ \(\frac{\sqrt{5}-\sqrt{3}}{\sqrt{5}+\sqrt{3}}+\frac{\sqrt{5}+\sqrt{3}}{\sqrt{5}-\sqrt{3}}-\frac{\sqrt{5}+1}{\sqrt{5}-1}\)
Tính
a/left(frac{2sqrt{3}-sqrt{6}}{sqrt{8}-2}-frac{sqrt{216}}{3}right).frac{1}{sqrt{6}}
b/left(frac{5}{4-sqrt{11}}+frac{1}{3+sqrt{7}}-frac{6}{sqrt{7}-2}-frac{sqrt{7}-5}{2}right)
c/left(frac{sqrt{14}-sqrt{7}}{1-sqrt{2}}+frac{sqrt{15}-sqrt{5}}{1-sqrt{3}}right):frac{1}{sqrt{7}-sqrt{5}}
d/frac{sqrt{5}-sqrt{3}}{sqrt{5}+sqrt{3}}+frac{sqrt{5}+sqrt{3}}{sqrt{5}-sqrt{3}}-frac{sqrt{5}+1}{sqrt{5}-1}
Đọc tiếp
Tính
a/\(\left(\frac{2\sqrt{3}-\sqrt{6}}{\sqrt{8}-2}-\frac{\sqrt{216}}{3}\right).\frac{1}{\sqrt{6}}\)
b/\(\left(\frac{5}{4-\sqrt{11}}+\frac{1}{3+\sqrt{7}}-\frac{6}{\sqrt{7}-2}-\frac{\sqrt{7}-5}{2}\right)\)
c/\(\left(\frac{\sqrt{14}-\sqrt{7}}{1-\sqrt{2}}+\frac{\sqrt{15}-\sqrt{5}}{1-\sqrt{3}}\right):\frac{1}{\sqrt{7}-\sqrt{5}}\)
d/\(\frac{\sqrt{5}-\sqrt{3}}{\sqrt{5}+\sqrt{3}}+\frac{\sqrt{5}+\sqrt{3}}{\sqrt{5}-\sqrt{3}}-\frac{\sqrt{5}+1}{\sqrt{5}-1}\)
\(\frac{5+\sqrt{3}}{\sqrt{5}+2}+\frac{\sqrt{5}}{\sqrt{5}-1}-\frac{3\sqrt{5}}{3+\sqrt{5}}\)
\(\sqrt{\frac{3-\sqrt{5}}{3+\sqrt{5}}}-\sqrt{\frac{3+\sqrt{5}}{3-\sqrt{5}}}\)
Rút gọn biểu thức:
a, \(\frac{-3}{4}\sqrt{9-4\sqrt{5}}\sqrt{\left(-8\right)^2\left(2+\sqrt{5}\right)^2}\)
b, \(\sqrt{5}-\sqrt{3-\sqrt{29-12\sqrt{5}}}\)
Đề: Thực hiện các phép toán sau:
a) 4sqrt{20} - 2sqrt{45} + 5sqrt{frac{1}{5}}
b) (3 + sqrt{2} )2 - 2sqrt{18}
c) frac{5sqrt{7}-sqrt{21}}{5-sqrt{3}} + sqrt{left(sqrt{7}-4right)^2}
d) sqrt[3]{81}:sqrt[3]{3}-sqrt[3]{-frac{2}{3}}.sqrt[3]{12}-sqrt[3]{125}
Đọc tiếp
Đề: Thực hiện các phép toán sau:
a) 4\(\sqrt{20}\) - 2\(\sqrt{45}\) + 5\(\sqrt{\frac{1}{5}}\)
b) (3 + \(\sqrt{2}\) )2 - 2\(\sqrt{18}\)
c) \(\frac{5\sqrt{7}-\sqrt{21}}{5-\sqrt{3}}\) + \(\sqrt{\left(\sqrt{7}-4\right)^2}\)
d) \(\sqrt[3]{81}:\sqrt[3]{3}-\sqrt[3]{-\frac{2}{3}}.\sqrt[3]{12}-\sqrt[3]{125}\)