bạn lên youtube tra:Top 1 khám phá 12 cung hoàng đạo là ra liền à

cung thứ 13 là cung thần nông

cung thứ 13 là cung xà phu

A = { 13; 14; 15 }

B = { 1; 2; 3; 4 }

C = { 13; 14; 15 }

A = { 13 ; 14 ; 15 }

B = { 4 ; 3 ; 2 ; 1 }

C = { 13 ; 14 ; 15 }

Trả lời :

A = { 12 ; 13 ; 14 ; 15 }

B = { 0 ; 1 ; 2 ; 3 ; 4 ; 5 }

C = { 13 ; 14 ; 15 }

6: \(=\dfrac{2^{20}\left(2^{20}-1+3^{20}\right)}{3^{20}\left(2^{20}-1+3^{20}\right)}=\left(\dfrac{2}{3}\right)^{20}\)

7: \(=\dfrac{7}{3}\left(19+\dfrac{1}{3}-33-\dfrac{1}{3}\right)-\dfrac{2}{7}=\dfrac{7}{3}\cdot\left(-14\right)-\dfrac{2}{7}\)

\(=-\dfrac{98}{3}-\dfrac{2}{7}=-\dfrac{692}{21}\)

8: \(=\dfrac{1}{9}-\left(\dfrac{1}{4}:2+\dfrac{7}{21}\cdot\dfrac{4}{16}\right)\)

\(=\dfrac{1}{9}-\dfrac{1}{8}-\dfrac{1}{12}=-\dfrac{7}{72}\)

10: =(-0,5)^2-17/2+0,5

=0,25+0,5-8,5

=-7,75

\(\Rightarrow3\left|x-\dfrac{21}{10}\right|=5,4\Rightarrow\left|x-\dfrac{21}{10}\right|=\dfrac{9}{5}\)

\(\Rightarrow\left[{}\begin{matrix}x-\dfrac{21}{10}=\dfrac{9}{5}\\x-\dfrac{21}{10}=-\dfrac{9}{5}\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}x=\dfrac{39}{10}\\x=\dfrac{3}{10}\end{matrix}\right.\)

Tìm x; y; z biết :

1)     x/2 = y/3 ; y/4 = z/5 và x – y + z  = 10

2)     4x = 3y ; 7y = 5z  và 2x + 3y - z= 136

3)     x-3/5 = y-5/1 = z+3/7 và 3x + 5y - 7z = 100

d: \(\Leftrightarrow\dfrac{x+14}{86}+1+\dfrac{x+15}{85}+1+\dfrac{x+16}{84}+1+\dfrac{x+17}{83}+1+\dfrac{x+116}{4}-4=0\)

=>x+100=0

hay x=-100

a: \(\Leftrightarrow2\left(x+1\right)^2+3\left(x^2-3x+2\right)=\left(3x-1\right)\left(x-4\right)+56\)

\(\Leftrightarrow2x^2+4x+2+3x^2-9x+6-\left(3x^2-13x+4\right)-56=0\)

\(\Leftrightarrow5x^2-5x-48-3x^2+13x-4=0\)

\(\Leftrightarrow2x^2+8x-52=0\)

\(\Leftrightarrow x^2+4x-13=0\)

\(\Leftrightarrow\left(x+2\right)^2=17\)

hay \(x\in\left\{-\sqrt{17}-2;\sqrt{17}-2\right\}\)

C

14-C

23D

24 C

1) = \(\frac{3}{5}\)

2) =\(\frac{6}{7}\)

3)\(\frac{9}{13}\)

4)\(\frac{4}{13}\)