Câu 1 :

a) $\frac{1}{2}$ . $\sqrt{64}$ - $\sqrt{}$$\frac{4}{25}$ + $(-1)^{2022}$ -/$\frac{-3}{7}$ /

= $\frac{1}{2}$ . 8 - $\frac{2}{5}$ + 1 - $\frac{3}{7}$

= 4 - $\frac{2}{5}$ + 1 - $\frac{3}{7}$

= $\frac{20}{5}$ - $\frac{2}{5}$ + 1 - $\frac{3}{7}$

= $\frac{18}{5}$+ 1 - $\frac{3}{7}$

= $\frac{18}{5}$ + $\frac{18}{5}$ - $\frac{3}{7}$

= $\frac{36}{5}$ - $\frac{3}{7}$

= $\frac{252}{35}$ - $\frac{15}{35}$

= $\frac{237}{35}$

b) 15 . ($\frac{-2}{3}$ )² - $\frac{7}{3}$ + ($\frac{2}{3}$ )³ - /-2/

= 15 . $\frac{4}{9}$  - $\frac{7}{3}$ + $\frac{-8}{27}$-2

 = $\frac{60}{9}$ - $\frac{7}{3}$ + $\frac{-8}{27}$ - 2

= $\frac{180}{27}$ - $\frac{63}{27}$ + $\frac{-8}{27}$ - $\frac{54}{27}$ 

= $\frac{180 - 63 +(- 8) - 54}{27}$      

= $\frac{55}{27}$ 

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