Question

Answer 1

\(Bài1.11:\\ \sqrt{81}=\sqrt{9^2}=9\\ \sqrt{100}=\sqrt{10^2}=10\\ \sqrt{121}=\sqrt{11^2}=11\\ \sqrt{144}=\sqrt{12^2}=12\\ \sqrt{169}=\sqrt{13^2}=13\\ \sqrt{196}=\sqrt{14^2}=14\\ \sqrt{225}=\sqrt{15^2}=15\\ \sqrt{0}=\sqrt{0^2}=0\)

Answer 2

1.4:

Các số vô tỉ là \(\sqrt{5};\Pi;3-\sqrt{5}\)