Question

so sánh (éo dùng máy tính:]]] )

a) \(\sqrt{7}\)+\(\sqrt{15}\) và 7

b) \(\sqrt{17}\)+ \(\sqrt{5}\) +1 và\(\sqrt{45}\)

Answer 1

a ) \(\sqrt{7}+\sqrt{15}vs7\)

=> \(\sqrt{7}+\sqrt{15}< 7\)

b ) \(\sqrt{17}+\sqrt{5}+1vs\sqrt{45}\)

=> \(\sqrt{17}+\sqrt{5}+1>\sqrt{45}\)

Answer 2

b, \(\sqrt{17}+\sqrt{5}+1\) và \(\sqrt{45}\)

\(\sqrt{17}+\sqrt{5}+1>\sqrt{16}+\sqrt{4}+1=4+2+1=7\)

\(\sqrt{45}< \sqrt{49}=7\)

\(\Rightarrow\sqrt{17}+\sqrt{5}+1>\sqrt{45}\)