Thu asked Hoa what they would make for their mother on Mother's Day

4)
\(A=\sqrt{20}-\sqrt{45}+\sqrt{6+2\sqrt{5}}\)
\(A=2\sqrt{5}-3\sqrt{5}+\sqrt{5+2\sqrt{5}+1}\)
\(A=-\sqrt{5}+\sqrt{\left(\sqrt{5}+1\right)^2}\)
\(A=-\sqrt{5}+\sqrt{5}+1\)
A=1

Tick
\(B=\dfrac{a-\sqrt{a}}{a-2\sqrt{a}+1}.\left(1-\sqrt{a}\right)\) với a>1
\(B=\dfrac{\sqrt{a}\left(\sqrt{a}-1\right)}{\left(\sqrt{a}-1\right)^2}\left(1-\sqrt{a}\right)\)
\(B=\dfrac{\sqrt{a}}{\sqrt{a}-1}\left(1-\sqrt{a}\right)\)
\(B=\dfrac{-\sqrt{a}}{1-\sqrt{a}}\left(1-\sqrt{a}\right)\)
\(B=-\sqrt{a}\)

Tick nha
1)
\(A=\dfrac{2}{2-\sqrt{3}}-\sqrt{12}+\dfrac{\sqrt{18}}{\sqrt{2}}\)
\(A=\dfrac{2\left(2+\sqrt{3}\right)}{\left(2-\sqrt{3}\right)\left(2+\sqrt{3}\right)}-\sqrt{12}+\dfrac{\sqrt{18}.\sqrt{2}}{\sqrt{2}.\sqrt{2}}\)
\(A=\dfrac{2\left(2+\sqrt{3}\right)}{4-3}-\sqrt{12}+\dfrac{6}{2}\)
\(A=2\left(2+\sqrt{3}\right)-\sqrt{12}+3\)
\(A=4+2\sqrt{3}-2\sqrt{3}+3\)
\(A=7\)
2)
\(A=2\sqrt{8}-5\sqrt{18}+4\sqrt{32}\)
\(A=2.2\sqrt{2}-5.3\sqrt{2}+4.4\sqrt{2}\)
\(A=4\sqrt{2}-15\sqrt{2}+16\sqrt{2}\)
\(A=5\sqrt{2}\)
 

\(\dfrac{51}{50};\dfrac{27}{26};\dfrac{25}{24};\dfrac{18}{17};\dfrac{4}{3}\)

DE=cos E .EF
DE=0,5.15
DE=7,5cm
DF=sinE.EF
DF=\(\dfrac{\sqrt{3}}{2}.15=\dfrac{15\sqrt{3}}{2}\)

16 am listening

16, listening
17,are you playing
18,  gets up,gets up
19, watch , listen
20,go
21,has,drinks
22, am reading, is watching
23,lives,lives
24,play
25,get up
26,goes,does
27,tells
28,are
29,does he watch
30,does she do

d) the very next day : ngay ngày hôm sau
mấy câu trên sai trật tự

1 is
2,who
3will
4 would
5where
6 where
7 at
8 see