va rooog!

Este urgent

Calculați:

[tex] \frac{2}{7} \: \: din \: 21[/tex]

[tex] \frac{22}{3} . \frac{6}{11} [/tex]

[tex]2 \frac{1}{4} .4[/tex]

[tex]5 \frac{1}{2} ( \frac{3}{2} + \frac{1}{3} )[/tex]

[tex]( \frac{2}{5} ) ^{20} .( \frac{25}{4} ) ^{10} [/tex]

Dau 15 puncte+coroană!!!!!!!!! Repede​