\(a\)
\(\sqrt{11}+\sqrt{19}\)
\(=\)\(\sqrt{11+19}\)
\(=\)\(\sqrt{30}\)
\(=\)\(5,47\)
\(\sqrt{47}\)
\(=6,85\)
\(5,47\)\(< \)\(6,85\)
\(=>\)\(\sqrt{11}+\sqrt{19}\)\(< \)\(\sqrt{47}\)
\(b\)
\(\sqrt{7}+\sqrt{26}+1\)
\(=\)\(\sqrt{7+26}+1\)
\(=\)\(\sqrt{33}+1\)
\(=\)\(5,74+1\)
\(=\)\(6,74\)
\(\sqrt{63}\)
\(=\)\(7,93\)
\(6,74\)\(< \)\(7,93\)
\(=>\)\(\sqrt{7}+\sqrt{26}+1\)\(< \)\(\sqrt{63}\)
Học tốt!!!