Bài 9: Căn bậc ba
Các câu hỏi tương tự
Rút gọn BT với \(x>0;x\ne8\)
\(P=\dfrac{8-x}{2+\sqrt[3]{x}}:\left(2+\dfrac{\sqrt[3]{x^2}}{2+\sqrt[3]{x}}\right)+\left(\sqrt[3]{x}+\dfrac{2\sqrt[3]{x}}{\sqrt[3]{x}-2}\right)\left(\dfrac{\sqrt[3]{x^2}-1}{\sqrt[3]{x^2}+2\sqrt[3]{x}}\right)\)
rút gọn biểu thức
P=\(\dfrac{8-x}{2+\sqrt[3]{x}}:\left(2+\dfrac{\sqrt[3]{x^2}}{2+\sqrt[3]{x}}\right)\)+\(\left(\sqrt[3]{x}+\dfrac{2\sqrt[3]{x}}{\sqrt[3]{x}-2}\right)\).\(\left(\dfrac{\sqrt[3]{x^2}-1}{\sqrt[3]{x^2}+\sqrt[3]{x}}\right)\)
1.Chứng minh:\(\dfrac{a+\sqrt{2+\sqrt{5}.}\sqrt{\sqrt{9-4\sqrt{5}}}}{3\sqrt{2-\sqrt{5}}.\sqrt[3]{\sqrt{9+4\sqrt{5}-}3\sqrt{a^2}+\sqrt[3]{a}}}\)=\(-\sqrt[3]{a}-1\)
2.Rút gọn: \(\left(\dfrac{a^3\sqrt[]{a}-2a^3\sqrt{b}+\sqrt[3]{a^2}-\sqrt[3]{b}}{\sqrt[3]{a^2-\sqrt[3]{ab}}}+\dfrac{\sqrt[3]{a^2b}-\sqrt[3]{ab^2}}{\sqrt[3]{a}-\sqrt[3]{b}}\right)1\dfrac{1}{\sqrt[3]{a^2}}\)
KF
27 tháng 9 2023 lúc 20:56
Thực hiện phép tính
a)\(\dfrac{\sqrt[3]{135}}{\sqrt[3]{5}}-\sqrt[3]{54}.\sqrt[3]{4}\)
b)\(\left(\sqrt[3]{25}-\sqrt[3]{10}+\sqrt[3]{4}\right)\)\(\left(\sqrt[3]{5}+\sqrt[3]{2}\right)\)
Rút gọn biểu thức:
\(B=\left(\dfrac{b}{b+8}-\dfrac{4b}{\left(\sqrt[3]{b}+2\right)^3}\right)\left(\dfrac{1+2\sqrt[3]{\dfrac{1}{b}}}{1-2\sqrt[3]{\dfrac{1}{b}}}\right)^2-\dfrac{24}{b+8}\)
Tính:
a) sqrt[3]{left(sqrt{2}+1right)left(3+2sqrt{2}right)}
b) sqrt[3]{left(4-2sqrt{3}right)left(sqrt{3}-1right)}
c) left(sqrt[3]{4}+1right)^3-left(sqrt[3]{4}-1right)^3
d) left(sqrt[3]{9}-sqrt[3]{6}+sqrt[3]{4}right)left(sqrt[3]{3}+sqrt[3]{2}right)
e) sqrt[3]{20+14sqrt{2}}+sqrt[3]{20-14sqrt{2}}
Mọi người giúp em với ạ!!!!!!!!!!!
Đọc tiếp
Tính:
a) \(\sqrt[3]{\left(\sqrt{2}+1\right)\left(3+2\sqrt{2}\right)}\)
b) \(\sqrt[3]{\left(4-2\sqrt{3}\right)\left(\sqrt{3}-1\right)}\)
c) \(\left(\sqrt[3]{4}+1\right)^3-\left(\sqrt[3]{4}-1\right)^3\)
d) \(\left(\sqrt[3]{9}-\sqrt[3]{6}+\sqrt[3]{4}\right)\left(\sqrt[3]{3}+\sqrt[3]{2}\right)\)
e) \(\sqrt[3]{20+14\sqrt{2}}+\sqrt[3]{20-14\sqrt{2}}\)
Mọi người giúp em với ạ!!!!!!!!!!!
tính P=\(\left(4x^3-6x^2-1\right)^{^{ }2014}\) với x=\(\dfrac{1}{2}\left(1+\sqrt[3]{3+2\sqrt{2}}+\sqrt[3]{3-2\sqrt{2}}\right)\)
Tính giá trị các biểu thức:
a)( \(\frac{1}{2}\sqrt[3]{9}-2\sqrt[3]{3}+3\sqrt[3]{\frac{1}{3}}\)) : \(2\sqrt[3]{\frac{1}{3}}\)
b)\(\left(12\sqrt[3]{2}+\sqrt[3]{16}-2\sqrt[3]{2}\right)\left(5\sqrt[3]{4}-3\sqrt[3]{\frac{1}{2}}\right)\)
Rút gọn các biểu thức:
a) A frac{sqrt[3]{135}}{sqrt[3]{5}}-sqrt[3]{54}sqrt[3]{4}
b) B left(frac{1}{2}sqrt[3]{2}-frac{1}{4}sqrt[3]{16}right).sqrt[3]{4}
c) C sqrt[3]{left(sqrt{2}+1right)left(3+2sqrt{2}right)}
d) D sqrt[3]{3+3sqrt[3]{2}+3sqrt[3]{4}}
e) E sqrt[3]{2+sqrt{5}}+sqrt[3]{2-sqrt{5}}
Đọc tiếp
Rút gọn các biểu thức:
a) A= \(\frac{\sqrt[3]{135}}{\sqrt[3]{5}}-\sqrt[3]{54}\sqrt[3]{4}\)
b) B= \(\left(\frac{1}{2}\sqrt[3]{2}-\frac{1}{4}\sqrt[3]{16}\right).\sqrt[3]{4}\)
c) C= \(\sqrt[3]{\left(\sqrt{2}+1\right)\left(3+2\sqrt{2}\right)}\)
d) D= \(\sqrt[3]{3+3\sqrt[3]{2}+3\sqrt[3]{4}}\)
e) E= \(\sqrt[3]{2+\sqrt{5}}+\sqrt[3]{2-\sqrt{5}}\)