so sánh
\(\sqrt{50}+\sqrt{\text{2}6}+1\) vs \(\sqrt{168}\)
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\(\sqrt{\left(1-\sqrt{50}\right)^2}=\sqrt{50}-1\approx6,07>6\)
\(\Rightarrow\sqrt{\left(1-\sqrt{50}\right)^2}>6\)
Ta có:\(\sqrt{\left(1-\sqrt{50}\right)^2}=|1-\sqrt{50}|=\sqrt{50}-1>\sqrt{49}-1=7-1=6\)
\(\Rightarrow\sqrt{\left(1-\sqrt{50}\right)^2>6}\)
Đặt \(A=\sqrt{50}+\sqrt{26}+1\)
Ta thấy: \(\sqrt{50}>\sqrt{49}=7,\sqrt{26}>\sqrt{25}=5\)
\(\Rightarrow A>\sqrt{49}+\sqrt{25}+1=7+5+1=13\left(1\right)\)
Ta thấy: \(\sqrt{168}< \sqrt{169}=13\left(2\right)\)
Từ (1) và (2) => \(\sqrt{50}+\sqrt{26}+1>13>\sqrt{168}\Rightarrow\sqrt{50}+\sqrt{26}+1>\sqrt{168}\)
\(\sqrt{50}>\sqrt{49}=7\)
\(\sqrt{26}>\sqrt{25}=5\)
\(\sqrt{1}=1\)
cộng vào \(VT>VP=13>\sqrt{169}>\sqrt{168}\)
thế này nhé:
\(\sqrt{50}>\sqrt{49}=7\)
\(\sqrt{26}>\sqrt{25}=5\)
\(\Rightarrow\sqrt{50}+\sqrt{26}>5+7+1=13\)
MÀ : \(\sqrt{168}<\sqrt{169}=13\)
=>\(\sqrt{50}+\sqrt{26}+1>\sqrt{49}+\sqrt{25}+1=13>\sqrt{168}\)
VẬY : \(\sqrt{50}+\sqrt{26}+1>\sqrt{168}\)
k cho mh nha bạn
a, \(7+\sqrt{5}\) ta co \(\sqrt{5}>\sqrt{4}\)(1)
\(\sqrt{48}+2\) \(\sqrt{48}<\sqrt{49}\)(2)
\(7+\sqrt{4}=7+2=9\)(3)
\(\sqrt{49}+2=7+2=9\)(4)
tu (1);(2);(3);(3) = > lam not di
b,\(1-\sqrt{50}\) cung so sanh \(\sqrt{50}voi\sqrt{49}\) tu lam not nha
k dung minh nha
Ta có:
\(\sqrt{50}+\sqrt{26}+1>\sqrt{49}+\sqrt{25}+1\)
\(=7+5+1=13\)
Mà \(\sqrt{168}< \sqrt{169}=13\)
Vì \(\sqrt{50}+\sqrt{26}+1>13>\sqrt{168}\)
Nên \(\sqrt{50}+\sqrt{26}+1>\sqrt{168}\)
ta có căn 50 + căn 26 + 1 > căn 49 + căn 25 +1=7+5+1+13 suy ra căn 50 +căn 26 +1 > căn 169 > căn 168
\(\sqrt[3]{\left(1-\sqrt{3}\right)\left(4-2\sqrt{3}\right)}=\sqrt[3]{\left(1-\sqrt{3}\right)\left(\sqrt{3}-1\right)^2}\)=\(\sqrt[3]{\left(1-\sqrt{3}\right)^3}\)=1-\(\sqrt{3}\)
\(\sqrt[3]{\left(1-\sqrt{5}\right)\left(6-2\sqrt{5}\right)}=\sqrt[3]{\left(1-\sqrt{5}\right)\left(\sqrt{5}-1\right)^2}\)=\(\sqrt[3]{\left(1-\sqrt{5}\right)^3}\)=1-\(\sqrt{5}\)
Ta thấy \(\sqrt{5}>\sqrt{3}\)nên 1-\(\sqrt{3}\)>\(1-\sqrt{5}\)
Vậy \(\sqrt[3]{\left(1-\sqrt{3}\right)\left(4-2\sqrt{3}\right)}\)>\(\sqrt[3]{\left(1-\sqrt{5}\right)\left(6-2\sqrt{5}\right)}\)
\(\sqrt{50}+\sqrt{26}+1>\sqrt{49}+\sqrt{25}+1=7+5+1=13=\sqrt{169}>\sqrt{168}\)