Bài 1:
a) \[\frac{a^{-n}+ b^{-n}}{a^{-n} b^{-n}} - \frac{a^{-n}- b^{-n}}{a^{-n}+ b^{-n}}\]
b) \[\frac{1}{4}(x.a^{-1}-a.x^{-1}).(\frac{a^{-1}-x^{-1}}{a^{-1}+x^{-1}}+\frac{a^{-1}+x^{-1}}{a^{-1}-x^{-1}})\]
Bài 2:
a)\[\left(\sqrt{x}-\sqrt[4]{x+1} \right)\left(\sqrt{x}+\sqrt[4]{x}+1 \right)\left(x-\sqrt{x}+1 \right) \left(x\succ 0 \right)\]
b)\[\left(\sqrt[6]{25+4\sqrt{6}}-\sqrt[3]{1+2\sqrt{6}} \right).\sqrt[3]{1-2\sqrt{6}}\]
Bài 3: Xác định a để:
a) \[\sqrt{a^{3\sqrt{a^{4}\sqrt{a}}}}=\sqrt[24]{2^{5}}.\frac{1}{\sqrt{2^{-1}}}\left(a\epsilon R \right)\]
a) \[\frac{a^{-n}+ b^{-n}}{a^{-n} b^{-n}} - \frac{a^{-n}- b^{-n}}{a^{-n}+ b^{-n}}\]
b) \[\frac{1}{4}(x.a^{-1}-a.x^{-1}).(\frac{a^{-1}-x^{-1}}{a^{-1}+x^{-1}}+\frac{a^{-1}+x^{-1}}{a^{-1}-x^{-1}})\]
Bài 2:
a)\[\left(\sqrt{x}-\sqrt[4]{x+1} \right)\left(\sqrt{x}+\sqrt[4]{x}+1 \right)\left(x-\sqrt{x}+1 \right) \left(x\succ 0 \right)\]
b)\[\left(\sqrt[6]{25+4\sqrt{6}}-\sqrt[3]{1+2\sqrt{6}} \right).\sqrt[3]{1-2\sqrt{6}}\]
Bài 3: Xác định a để:
a) \[\sqrt{a^{3\sqrt{a^{4}\sqrt{a}}}}=\sqrt[24]{2^{5}}.\frac{1}{\sqrt{2^{-1}}}\left(a\epsilon R \right)\]
Sửa lần cuối bởi điều hành viên: