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Bài 8: Rút gọn biểu thức chứa căn bậc hai
Các câu hỏi tương tự
Bài : Thu gọn1) dfrac{3sqrt{5}-5sqrt{3}}{sqrt{15}-3}2) dfrac{sqrt{5+2sqrt{6}}}{sqrt{2}+sqrt{3}}3) dfrac{7+4sqrt{3}}{2+sqrt{3}}4) dfrac{16-6sqrt{7}}{sqrt{7}-3}5) dfrac{left(sqrt{3}-sqrt{2}right)^2+4sqrt{6}}{sqrt{3}+sqrt{2}}6) dfrac{left(sqrt{3}+2sqrt{5}right)^2-8sqrt{15}}{sqrt{6-2sqrt{10}}}
Đọc tiếp
Bài : Thu gọn
1) \(\dfrac{3\sqrt{5}-5\sqrt{3}}{\sqrt{15}-3}\)
2) \(\dfrac{\sqrt{5+2\sqrt{6}}}{\sqrt{2}+\sqrt{3}}\)
3) \(\dfrac{7+4\sqrt{3}}{2+\sqrt{3}}\)
4) \(\dfrac{16-6\sqrt{7}}{\sqrt{7}-3}\)
5) \(\dfrac{\left(\sqrt{3}-\sqrt{2}\right)^2+4\sqrt{6}}{\sqrt{3}+\sqrt{2}}\)
6) \(\dfrac{\left(\sqrt{3}+2\sqrt{5}\right)^2-8\sqrt{15}}{\sqrt{6-2\sqrt{10}}}\)
1. Asqrt{4+sqrt{7}} +sqrt{4-sqrt{7}}
2. B dfrac{sqrt{sqrt{7-sqrt{3}}-sqrt{7+sqrt{3}}}}{sqrt{7-sqrt{2}}}
3. Csqrt{6+2sqrt{2cdotsqrt{3-sqrt{4+2sqrt{3}}}}}
4. Dsqrt{5}-sqrt{3-sqrt{29-12sqrt{5}}}
5 Edfrac{1+sqrt{5}}{sqrt{2}+sqrt{3}+sqrt{5}} +dfrac{1-sqrt{5}}{sqrt{2}-sqrt{3-sqrt{5}}}
6. so sánh Cho Asqrt{11+sqrt{96}}
B dfrac{2sqrt{2}}{1+sqrt{2-sqrt{3}}} so sánh A và b
Đọc tiếp
1. A=\(\sqrt{4+\sqrt{7}}\) +\(\sqrt{4-\sqrt{7}}\)
2. B= \(\dfrac{\sqrt{\sqrt{7-\sqrt{3}}-\sqrt{7+\sqrt{3}}}}{\sqrt{7-\sqrt{2}}}\)
3. C=\(\sqrt{6+2\sqrt{2\cdot\sqrt{3-\sqrt{4+2\sqrt{3}}}}}\)
4. D=\(\sqrt{5}-\sqrt{3-\sqrt{29-12\sqrt{5}}}\)
5 E=\(\dfrac{1+\sqrt{5}}{\sqrt{2}+\sqrt{3}+\sqrt{5}}\) +\(\dfrac{1-\sqrt{5}}{\sqrt{2}-\sqrt{3-\sqrt{5}}}\)
6. so sánh Cho A=\(\sqrt{11+\sqrt{96}}\)
B= \(\dfrac{2\sqrt{2}}{1+\sqrt{2-\sqrt{3}}}\) so sánh A và b
rút gọn các biểu thức sau:dfrac{1}{2}sqrt{20}+5sqrt{16}+sqrt{64}sqrt{20}-sqrt{45}+3sqrt{18}sqrt{left(2-sqrt{2}right)^2}+sqrt{2}A dfrac{2}{sqrt{7}-5}-dfrac{2}{sqrt{7}+5}Bdfrac{sqrt{7}+sqrt{5}}{sqrt{7}-sqrt{5}}+dfrac{sqrt{7}-sqrt{5}}{sqrt{7}+sqrt{5}}mình cần gấp á. tại vì mình khá là ngu toán nên giúp mik vs
Đọc tiếp
rút gọn các biểu thức sau:
\(\dfrac{1}{2}\sqrt{20}+5\)
\(\sqrt{16}+\sqrt{64}\)
\(\sqrt{20}-\sqrt{45}+3\sqrt{18}\)
\(\sqrt{\left(2-\sqrt{2}\right)^2}+\sqrt{2}\)
A= \(\dfrac{2}{\sqrt{7}-5}-\dfrac{2}{\sqrt{7}+5}\)
B=\(\dfrac{\sqrt{7}+\sqrt{5}}{\sqrt{7}-\sqrt{5}}+\dfrac{\sqrt{7}-\sqrt{5}}{\sqrt{7}+\sqrt{5}}\)
mình cần gấp á. tại vì mình khá là ngu toán nên giúp mik vs
Rút gọn các biểu thức:
1. sqrt{28}-2sqrt{252}+3sqrt{175}+3sqrt{567}
2. sqrt{left(sqrt{3}+1right)^2}+sqrt{7-4sqrt{3}}
3. sqrt{9-4sqrt{5}}-sqrt{dfrac{8}{7-3sqrt{5}}}
4. dfrac{sqrt{3}}{2-sqrt{3}}+dfrac{2}{2+sqrt{3}}
5. dfrac{2sqrt{2}+1}{1+sqrt{2}}+dfrac{1-2sqrt{2}}{1-sqrt{2}}+left(2-sqrt{3}right).left(2+sqrt{3}right)
6. sqrt{dfrac{2}{3-sqrt{5}}}+sqrt{dfrac{2}{7+sqrt{45}}}
7. dfrac{sqrt{2}}{sqrt{1+sqrt{2}}-1}-dfrac{sqrt{2}}{sqrt{1+sqrt{2}}+1}
8. sqrt{6-2sqrt{5}}+sqrt{dfrac{3-sqrt{5}}{3+sqrt{...
Đọc tiếp
Rút gọn các biểu thức:
1. \(\sqrt{28}-2\sqrt{252}+3\sqrt{175}+3\sqrt{567}\)
2. \(\sqrt{\left(\sqrt{3}+1\right)^2}+\sqrt{7-4\sqrt{3}}\)
3. \(\sqrt{9-4\sqrt{5}}-\sqrt{\dfrac{8}{7-3\sqrt{5}}}\)
4. \(\dfrac{\sqrt{3}}{2-\sqrt{3}}+\dfrac{2}{2+\sqrt{3}}\)
5. \(\dfrac{2\sqrt{2}+1}{1+\sqrt{2}}+\dfrac{1-2\sqrt{2}}{1-\sqrt{2}}+\left(2-\sqrt{3}\right).\left(2+\sqrt{3}\right)\)
6. \(\sqrt{\dfrac{2}{3-\sqrt{5}}}+\sqrt{\dfrac{2}{7+\sqrt{45}}}\)
7. \(\dfrac{\sqrt{2}}{\sqrt{1+\sqrt{2}}-1}-\dfrac{\sqrt{2}}{\sqrt{1+\sqrt{2}}+1}\)
8. \(\sqrt{6-2\sqrt{5}}+\sqrt{\dfrac{3-\sqrt{5}}{3+\sqrt{5}}}-\sqrt{\dfrac{3+\sqrt{5}}{3-\sqrt{5}}}\)
tính giá trị biểu thức :
a, \(\left(\sqrt{28}+2\sqrt{14}+\sqrt{7}\right)\sqrt{7}-\left(7+\sqrt{2}\right)^2\)
b, \(\sqrt{\dfrac{5}{2}}+\dfrac{\sqrt{2}}{\sqrt{3}+\sqrt{5}}\)
c, \(\dfrac{8+2\sqrt{15}}{\sqrt{5}+\sqrt{3}}+\dfrac{7-2\sqrt{10}}{\sqrt{5}-\sqrt{2}}\)
d,\(\dfrac{3+4\sqrt{3}}{\sqrt{6}+\sqrt{2}-\sqrt{5}}\)
1. Asqrt{4+sqrt{ }7}+ sqrt{4-sqrt{ }7} 2. Bdfrac{sqrt{sqrt{7-sqrt{3}}}-sqrt{sqrt{7+sqrt{3}}}}{sqrt{sqrt{7}-sqrt{2}}} 3. Csqrt{6+2sqrt{2cdotsqrt{3-sqrt{4+2sqrt{3}}}}} 4. Dsqrt{5}-sqrt{3-sqrt{29-12sqrt{5}}}...
Đọc tiếp
1. A=\(\sqrt{4+\sqrt{ }7}\)+ \(\sqrt{4-\sqrt{ }7}\) 2. B=\(\dfrac{\sqrt{\sqrt{7-\sqrt{3}}}-\sqrt{\sqrt{7+\sqrt{3}}}}{\sqrt{\sqrt{7}-\sqrt{2}}}\) 3. C=\(\sqrt{6+2\sqrt{2\cdot\sqrt{3-\sqrt{4+2\sqrt{3}}}}}\) 4. D=\(\sqrt{5}-\sqrt{3-\sqrt{29-12\sqrt{5}}}\) 5. so sánh Cho A=\(\sqrt{11+\sqrt{96}}\) B=\(\dfrac{2\sqrt{2}}{\sqrt{1+\sqrt{2-\sqrt{3}}}}\) so sánh A và B
Rút gọn căn thức sau:
\(B= \dfrac{\sqrt{7-\sqrt{5}}+\sqrt{7+\sqrt{5}}}{\sqrt{7+2\sqrt{11}}}.\dfrac{\sqrt{2}+\sqrt{3}+\sqrt{6}+\sqrt{8}+4}{\sqrt{2}+\sqrt{3}+\sqrt{4}}\)
Rút gọn:
1) \(\dfrac{3\sqrt{5}-5\sqrt{3}}{\sqrt{15}-3}\)
2) \(\dfrac{\sqrt{5+2\sqrt{6}}}{\sqrt{2}+\sqrt{3}}\)
3) \(\dfrac{7+4\sqrt{3}}{2+\sqrt{3}}\)
Rút Gọn Biểu Thức
A=\(\sqrt{7+3\sqrt{5}}+\sqrt{7-3\sqrt{5}}\)
B=\(\sqrt{2-\sqrt{2\sqrt{5}-2}}-\sqrt{2+\sqrt{2\sqrt{5}-2}}\)