Các mệnh đề sau đúng/sai

a) Sai

b) Đúng

c) Sai

d) Sai

 

Ta có:

\[\left( {\frac{2}{5}} \right) < \left( {\frac{3}{7}} \right) \Rightarrow {\left( {\frac{2}{5}} \right)^{\sqrt 2 }} < {\left( {\frac{3}{7}} \right)^{\sqrt 2 }}\].

\(\frac{2}{3} > \frac{1}{3} \Rightarrow {\left( {\frac{2}{3}} \right)^{ - 3}} < {\left( {\frac{1}{3}} \right)^{ - 3}}\).

\[2 < 4 \Rightarrow {2^{ - \sqrt 3 }} > {4^{ - \sqrt 3 }} \Rightarrow {2^{ - \sqrt 3 }} > {\left( {\frac{1}{4}} \right)^{\sqrt 3 }}\].

\({\left( {\frac{1}{4}} \right)^{ - 50}} < {\left( {\sqrt 2 } \right)^{200}} \Leftrightarrow {\left( {{2^{ - 2}}} \right)^{ - 50}} < {\left( {{2^{\frac{1}{2}}}} \right)^{200}} \Leftrightarrow {2^{100}} < {2^{100}}\), sai.