b: Ta có: \(4\sqrt{5}=\sqrt{4^2\cdot5}=\sqrt{80}\)

\(5\sqrt{3}=\sqrt{5^2\cdot3}=\sqrt{75}\)

mà 80>75

nên \(4\sqrt{5}>5\sqrt{3}\)

Bài 1: 

Để M có nghĩa thì \(\left\{{}\begin{matrix}x+4\ge0\\2-x\ge0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x\ge-4\\x\le2\end{matrix}\right.\Leftrightarrow-4\le x\le2\)

Số giá trị nguyên thỏa mãn điều kiện là:

\(\left(2+4\right)+1=7\)

\(\left(\sqrt{2}+\sqrt{3}\right)^2=5+2\sqrt{6}>2^2=4\left(5>4\right)\\ \Leftrightarrow\sqrt{2}+\sqrt{3}>2\)

\(\left(\sqrt{8}+\sqrt{5}\right)^2=13+2\sqrt{40};\left(\sqrt{7}-\sqrt{6}\right)^2=13-2\sqrt{42}\\ 2\sqrt{40}>0>-2\sqrt{42}\\ \Leftrightarrow13+2\sqrt{40}>13-2\sqrt{42}\\ \Leftrightarrow\left(\sqrt{8}+\sqrt{5}\right)^2>\left(\sqrt{7}-\sqrt{6}\right)^2\\ \Leftrightarrow\sqrt{8}+\sqrt{5}>\sqrt{7}-\sqrt{6}\)

\(\sqrt{2}\) + \(\sqrt{3}\)  > 2

\(\sqrt{10}+\sqrt{13}< \sqrt{7}+\sqrt{17}\)

kick nhaNguyễn Đức

Bạn có biết cách giải không vậy? Giup mình với. 

\(a\)

\(\sqrt{7}+\sqrt{15}\) 

\(=\sqrt{7+15}\)

\(=4,69\)

\(4,69< 7\)

\(\Rightarrow\sqrt{7}+\sqrt{15}< 7\)

\(b\)

\(\sqrt{7}+\sqrt{15}+1\)

\(=\sqrt{7+15}+1\)

\(=4,69+1\)

\(=5,69\)

\(\sqrt{45}\)

\(=6,7\)

\(5,69< 6,7\)

\(\Rightarrow\)\(\sqrt{7}+\sqrt{15}+1\)\(< \)\(\sqrt{45}\)

\(c\)

\(\frac{23-2\sqrt{19}}{3}\)

\(=\frac{22.4,53}{3}\)

\(=\frac{95,7}{3}\)

\(=31,9\)

\(\sqrt{27}\)

\(=5,19\)

\(31,9>5,19\)

\(\text{​​}\Rightarrow\text{​​}\text{​​}\)\(\frac{23-2\sqrt{19}}{3}\)\(>\sqrt{27}\)

\(d\)

\(\sqrt{3\sqrt{2}}\)

\(=\sqrt{3.1,41}\)

\(=\sqrt{4,23}\)

\(=2,05\)

\(\sqrt{2\sqrt{3}}\)

\(=\sqrt{2.1,73}\)

\(=\sqrt{3,46}\)

\(=1,86\)

\(2,05>1,86\)

\(\Rightarrow\sqrt{3\sqrt{2}}>\sqrt{2\sqrt{3}}\)

\(Học \) \(Tốt !!!\)

a) Ta có : \(\sqrt{7}< \sqrt{9}=3;\sqrt{15}< \sqrt{16}=4\)

Do đó : \(\sqrt{7}+\sqrt{15}< 3+4=7\)

b) Ta có : \(\sqrt{17}>\sqrt{16}=4;\sqrt{5}>\sqrt{4}=2\)

\(\Rightarrow\sqrt{17}+\sqrt{5}+1>4+2+1=7\)

Lại có : \(\sqrt{45}< \sqrt{49}< 7\)

Do đó : \(\sqrt{17}+\sqrt{5}+1>\sqrt{45}\)

c) Ta thấy : \(\sqrt{19}>\sqrt{16}=4\)

\(\Rightarrow2\sqrt{19}>2.4=8\)

\(\Rightarrow-2\sqrt{19}< -8\)

\(\Rightarrow23-2\sqrt{19}< 23-8=15\)

\(\Rightarrow\frac{23-2\sqrt{19}}{3}< 5\). Mặt khác : \(\sqrt{27}>\sqrt{25}=5\)

Nên : \(\frac{23-2\sqrt{19}}{3}< \sqrt{27}\)

d) Vì : \(18>12>0\Rightarrow\sqrt{18}>\sqrt{12}>0\)

\(\Leftrightarrow3\sqrt{2}>2\sqrt{3}>0\)

\(\Rightarrow\sqrt{3\sqrt{2}}>\sqrt{2\sqrt{3}}\)

\(A=\sqrt{6+2\sqrt{5}}-\sqrt{5}=\sqrt{5}+1-\sqrt{5}=1\)

\(B=\sqrt[3]{7+5\sqrt{2}}-\sqrt{2}=\sqrt{2}+1-\sqrt{2}=1\)

Do đó: A=B

\(\sqrt{6+2\sqrt{5}}-\sqrt{5}=\sqrt{\left(\sqrt{5}+1\right)^2}-\sqrt{5}=\left|\sqrt{5}+1\right|-\sqrt{5}=1\)

\(\sqrt[3]{7+5\sqrt{2}}-\sqrt{2}=\sqrt[3]{\left(\sqrt{2}\right)^3+1^3+3.2+3\sqrt{2}}-\sqrt{2}=\sqrt[3]{\left(\sqrt{2}+1\right)^3}-\sqrt{2}=\sqrt{2}+1-\sqrt{2}=1\)

--> Bằng nhau

a: \(4\sqrt{7}=\sqrt{4^2\cdot7}=\sqrt{112}\)

\(3\sqrt{13}=\sqrt{3^2\cdot13}=\sqrt{117}\)

mà 112<117

nên \(4\sqrt{7}< 3\sqrt{13}\)

b: \(3\sqrt{12}=\sqrt{3^2\cdot12}=\sqrt{108}\)

\(2\sqrt{16}=\sqrt{16\cdot2^2}=\sqrt{64}\)

mà 108>64

nên \(3\sqrt{12}>2\sqrt{16}\)

c: \(\dfrac{1}{4}\sqrt{84}=\sqrt{\dfrac{1}{16}\cdot84}=\sqrt{\dfrac{21}{4}}\)

\(6\sqrt{\dfrac{1}{7}}=\sqrt{36\cdot\dfrac{1}{7}}=\sqrt{\dfrac{36}{7}}\)

mà \(\dfrac{21}{4}>\dfrac{36}{7}\)

nên \(\dfrac{1}{4}\sqrt{84}>6\sqrt{\dfrac{1}{7}}\)

d: \(3\sqrt{12}=\sqrt{3^2\cdot12}=\sqrt{108}\)

\(2\sqrt{16}=\sqrt{16\cdot2^2}=\sqrt{64}\)

mà 108>64

nên \(3\sqrt{12}>2\sqrt{16}\)

a) \(\sqrt[3]{7+5\sqrt{2}}=\sqrt{2}+1\)

b) \(-6\sqrt[3]{7}=\sqrt[3]{\left(-6\right)^3\cdot7}=\sqrt[3]{-1512}\)

\(7\sqrt[3]{-6}=\sqrt[3]{7^3\cdot\left(-6\right)}=\sqrt[3]{-2058}\)

mà -1512>-2058

nên \(-6\sqrt[3]{7}>7\cdot\sqrt[3]{-6}\)

Ta có: 

\(R=\)\(\dfrac{3+\sqrt{5}}{2\sqrt{2}+\sqrt{3+\sqrt{5}}}+\dfrac{3-\sqrt{5}}{2\sqrt{2}-\sqrt{3-\sqrt{5}}}\)

\(=\)\(\dfrac{\sqrt{10}+3\sqrt{2}}{5+\sqrt{5}}+\dfrac{\sqrt{10}-3\sqrt{2}}{5-\sqrt{5}}\)

\(=\dfrac{4\sqrt{2}}{\sqrt{5}\left(\sqrt{5}+1\right)\left(\sqrt{5}-1\right)}\)

\(=\dfrac{4\sqrt{2}}{4\sqrt{5}}=\sqrt{\dfrac{2}{5}}\)

Làm câu S tương tự như này rồi đối chiếu kết quả nha