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Câu hỏi của Thẩm Thiên Tình - Toán lớp 9 | Học trực tuyến

\(\left(\sqrt{3}-1\right)\sqrt{6+2\sqrt{2}\sqrt{3-\sqrt{\sqrt{2}+\sqrt{12}+\sqrt{18-\sqrt{128}}}}}\)

\(=\left(\sqrt{3}-1\right)\sqrt{6+2\sqrt{2}\sqrt{3-\sqrt{\sqrt{2}+2\sqrt{3}+\sqrt{4^2-2.4.\sqrt{2}+\sqrt{2^2}}}}}\)

\(=\left(\sqrt{3}-1\right)\sqrt{6+2\sqrt{2}\sqrt{3-\sqrt{\sqrt{2}+2\sqrt{3}+\sqrt{\left(4-\sqrt{2}\right)^2}}}}\)

\(=\left(\sqrt{3}-1\right)\sqrt{6+2\sqrt{2}\sqrt{3-\sqrt{\sqrt{2}+2\sqrt{3}+\left|4-\sqrt{2}\right|}}}\)

\(=\left(\sqrt{3}-1\right)\sqrt{6+2\sqrt{2}\sqrt{3-\sqrt{\sqrt{2}+2\sqrt{3}+4-\sqrt{2}}}}\)

\(=\left(\sqrt{3}-1\right)\sqrt{6+2\sqrt{2}\sqrt{3-\sqrt{4+2\sqrt{3}}}}\)

\(=\left(\sqrt{3}-1\right)\sqrt{6+2\sqrt{2}\sqrt{3-\sqrt{\left(\sqrt{3}+1\right)^2}}}\)

\(=\left(\sqrt{3}-1\right)\sqrt{6+2\sqrt{2}\sqrt{3-\sqrt{3}-1}}\)

\(=\left(\sqrt{3}-1\right)\sqrt{6+2\sqrt{2}\sqrt{2-\sqrt{3}}}\)

\(=\left(\sqrt{3}-1\right)\sqrt{6+2\sqrt{4-2\sqrt{3}}}\)

\(=\left(\sqrt{3}-1\right)\sqrt{6+2\sqrt{\left(\sqrt{3}-1\right)^2}}\)

\(=\left(\sqrt{3}-1\right)\sqrt{6+2\left|\sqrt{3}-1\right|}\)

\(=\left(\sqrt{3}-1\right)\sqrt{6+2\sqrt{3}-2}\)

\(=\left(\sqrt{3}-1\right)\sqrt{4+2\sqrt{3}}\)

\(=\left(\sqrt{3}-1\right)\sqrt{\left(\sqrt{3}+1\right)^2}\)

\(=\left(\sqrt{3}-1\right)\left(\sqrt{3}+1\right)\)

\(=\sqrt{3^2}-1^2\\ =3-1\\ =2\)

๖ۣۜᏦᎧᎳ•Trần Hiến๖ۣۜᏟᏞυβ

\(B=\sqrt{6+2\sqrt{2}\cdot\sqrt{3-\sqrt{\sqrt{2}+\sqrt{12}+\sqrt{18-\sqrt{128}}}}}\)

\(B=\sqrt{6+2\sqrt{2}\cdot\sqrt{3-\sqrt{\sqrt{2}+\sqrt{12}+\sqrt{18-8\sqrt{2}}}}}\)

\(B=\sqrt{6+2\sqrt{2}\cdot\sqrt{3-\sqrt{\sqrt{2}+\sqrt{12}+\sqrt{\left(4-\sqrt{2}\right)^2}}}}\)

\(B=\sqrt{6+2\sqrt{2}\cdot\sqrt{3-\sqrt{\sqrt{2}+\sqrt{12}+4-\sqrt{2}}}}\)

\(B=\sqrt{6+2\sqrt{2}\cdot\sqrt{3-\sqrt{4+2\sqrt{3}}}}\)

\(B=\sqrt{6+2\sqrt{2}\cdot\sqrt{3-\sqrt{\left(\sqrt{3}+1\right)^2}}}\)

\(B=\sqrt{6+2\sqrt{2}\cdot\sqrt{3-\sqrt{3}+1}}\)

\(B=\sqrt{6+2\sqrt{2}\cdot\sqrt{2-\sqrt{3}}}\)

\(B=\sqrt{6+2\cdot\sqrt{4-2\sqrt{3}}}\)

\(B=\sqrt{6+2\cdot\sqrt{\left(\sqrt{3}-1\right)^2}}\)

\(B=\sqrt{6+2\left(\sqrt{3}-1\right)}\)

\(B=\sqrt{4+2\sqrt{3}}\)

\(B=\sqrt{\left(\sqrt{3}+1\right)^2}\)

\(B=\sqrt{3}+1\)

đây

Tính máy tính đc ko bạn:))))

Ta có \(\sqrt{18-\sqrt{128}}\)

= \(\sqrt{18-8\sqrt{2}}\)

= \(\sqrt{16-2×4×\sqrt{2}+2}\)

= \(4-\sqrt{2}\)

Từ đó cái ban đầu

= \(\sqrt{6+2\sqrt{2}\sqrt{3-\sqrt{4+2\sqrt{3}}}}\)

= \(\sqrt{6+2\sqrt{2}\sqrt{2-\sqrt{3}}}\)

= \(\sqrt{6+2\sqrt{4-2\sqrt{3}}}\)

= \(\sqrt{6+2\sqrt{3}-2}\)

= \(\sqrt{4+2\sqrt{3}}\)

= \(\sqrt{3}+1\)

\(\sqrt{3}-1\)

\(\sqrt{3}\)-1

\(A=\sqrt{6+2\sqrt{2}\cdot\sqrt{3-\sqrt{\sqrt{2}+\sqrt{12+\sqrt{18}+\sqrt{128}}}}}\)

\(=\sqrt{6+2\sqrt{2\cdot\left(3-\sqrt{\sqrt{2}+\sqrt{12+\sqrt{18}+\sqrt{128}}}\right)}}\)

\(=\sqrt{6+2\sqrt{2\left(3-\sqrt{\sqrt{2}+\sqrt{12+3\sqrt{2}+8\sqrt{2}}}\right)}}\)

\(=\sqrt{6+2\sqrt{2\left(3-\sqrt{\sqrt{2}+\sqrt{12+11\sqrt{2}}}\right)}}\)

\(=\sqrt{6+2\sqrt{6}-2\sqrt{\sqrt{2}+\sqrt{12+11\sqrt{2}}}}\)