d: \(\left(2\sqrt{3}+1\right)^2=13+4\sqrt{3}\)
\(\left(3\sqrt{2}\right)^2=18=13+5\)
mà 4 căn 3>5
nên 2 căn 3+1>3 căn 2
e: \(\left(3+\sqrt{5}\right)^2=14+6\sqrt{5}\)
\(\left(\sqrt{7}+1\right)^2=8+2\sqrt{7}\)
mà 14>8; 6 căn 5>2 căn 7
nên 3+căn 5>căn 7+1