Question

Bài 1:Rút gọ các biểu thức sau

a)16\(\sqrt{\dfrac{1}{2}}-3\sqrt{8}-2\left(\sqrt{2}-1\right)^2\)

b)\(\dfrac{1}{2-\sqrt{3}}+\dfrac{\sqrt{2}^2+\sqrt{2}}{1+\sqrt{2}}-\sqrt{\left(\sqrt{2}-\sqrt{3}\right)^2}\)

c)\(\sqrt[3]{-27}+\sqrt{2}.\sqrt{8}\)

d)\(\dfrac{\sin25^0}{\cos65^0}+sin^235^0-\left(2023-\cos^235^0\right)\)

Answer 1

Mn giúp e với ak

 

Answer 2

c: \(\sqrt[3]{-27}+\sqrt{2}\cdot\sqrt{8}\)

\(=-3+4\)

=1

Answer 3

d) sin 25 / cos 65 + sin² 35 -(2023 - cos² 35)

= sin 25 / sin 25 + 1 -2023

= 1 + 1 -2023 =2021