14) \(\sqrt{7-4\sqrt{3}}=2-\sqrt{3}\)

15) \(\sqrt{8+2\sqrt{15}}=\sqrt{5}+\sqrt{3}\)

16) \(\sqrt{10-2\sqrt{21}}=\sqrt{7}-\sqrt{3}\)

17) \(\sqrt{11+2\sqrt{18}}=3+\sqrt{2}\)

18) \(\sqrt{7+2\sqrt{10}}=\sqrt{5}+\sqrt{2}\)

19) \(\sqrt{7+4\sqrt{3}}=2+\sqrt{3}\)

20) \(\sqrt{12-2\sqrt{35}}=\sqrt{7}-\sqrt{5}\)

\(\sqrt{7-4\sqrt{3}}=\sqrt{2^2-2.2.\sqrt{3}+\left(\sqrt{3}\right)^2}=\sqrt{\left(2-\sqrt{3}\right)^2}=\left|2-\sqrt{3}\right|=2-\sqrt{3}\)

√7−4√3=√22−2.2.√3+(√3)2=√(2−√3)2=∣∣2−√3∣∣=2−√3

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What your hobby 

.....................

a: Đ

b: S

c: Đ

d: Đ

a, Đ

b,S

c,Đ

d,Đ

nhanh hộ mik đc ko ạ? Mik đang cần gấp 

a)2/15<8/17

b)12/17<13/18

c)9/20>3/7

d)17/18>15/19

@Trần Minh Tuấn Hữu co thể viết ra cách giải hộ mik đc ko?

a) Ta có: \(-19-\left|+13\right|+\left|-10\right|-\left(-5\right)-11\)

\(=-19-13+10+5-11\)

\(=-28\)

b) Ta có: \(\left(-10\right)-\left(11\right)+\left|-5\right|-\left|-7\right|-8\)

\(=-10-11+5-7-8\)

\(=-31\)

c) Ta có: \(-\left(-8\right)-\left(+7\right)-\left|-11\right|+\left|+12\right|\)

\(=8-7-11+12\)

\(=2\)

d) Ta có: \(-14-\left|-18\right|-\left(-20\right)-\left|-25\right|\)

\(=-14-18+20-25\)

\(=-37\)

đ) Ta có: \(23-\left|-15\right|-\left(-17\right)+\left|-13\right|\)

\(=23-15+17+13\)

\(=38\)

=(10 + 20) + (11 + 19) + (12 + 18) + (13 + 17) + (14 + 16) +15

= 30 + 30 + 30 + 30 + 30 + 15

=165

10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20

= (10 + 20) + (11 + 19) + (12 + 18) + (13 + 17) + (14 + 16) + 15

= 30 + 30 + 30 + 30 + 30 + 15

= 30 x 5 + 15

= 150 + 15

= 165

k cho mk nha bn !

10 + 11 + 12 + 13 + 14 + 15 + 16 + 1 7 + 18 + 19 + 20

=(10 + 20) + (11 + 19) + (12 + 18) + (13 + 17) + (14 + 16) + 15

= 30 x 5 + 5

= 150 + 5

= 155