Hãy so sánh mỗi số sau với 1.
a) \({2^{ – 2}}\)
b) \({(0,013)^{ – 1}}\)
c) \({({2 \over 7})^5}\)
d) \({({1 \over 2})^{\sqrt 3 }}\)
e) \({({\pi \over 4})^{\sqrt 5 – 2}}\)
g) \({({1 \over 3})^{\sqrt 8 – 3}}\)
Hướng dẫn làm bài:
a) \({2^{ – 2}} = {1 \over {{2^2}}} < 1\)
b) \({(0,013)^{ – 1}} = {1 \over {0,013}} > 1\)
c) Tương tự, \({({2 \over 7})^5} < 1\)
d) \({({1 \over 2})^{\sqrt 3 }} < 1\)
e) \({({\pi \over 4})^{\sqrt 5 – 2}} < 1\)
g) \({({1 \over 3})^{\sqrt 8 – 3}} > 1\)