https://freefire.ff.garena.vn?code=a9c37560-de15-11ea-a3f0-552a419ccfac

Copy link lên gg rồi đăng nhập fb là sẽ đc k 

Không trả lời thì đừng viết. Làm mấy điều thiểu năng đấy không sợ bị chửi à

Số số hạng là : \(\left(28,16-8,21\right):\left(9,26-8,21\right)+1=20\)

Tổng = \(\left(28,61+8,21\right)x20:2=368,2\)

Đấy là làm theo công thức đấy

77777777777777777777777777

mình đang cần gấp  ạ ! mong mọi ngươi giúp ạ

A= 32 x 53 - 31
A= 1696 - 31
A= 1665
k cho mình nhaaaa
Kb đi nè :333

a=32×53-31

a=1696-31

a=1665

+) \(2x\left(x-4\right)-x\left(2x+3\right)+22=0\)

\(\Leftrightarrow2x^2-8x-2x^2-3x+22=0\)

\(\Leftrightarrow-11x+22=0\)

\(\Leftrightarrow-11\left(x-2\right)=0\)

\(\Leftrightarrow x-2=0\Leftrightarrow x=2\)

+) \(\left(2x+3\right)\left(3x+2\right)+2\left(1-3x\right)\left(x+\frac{1}{2}\right)=1\)

\(\Leftrightarrow6x^2+4x+9x+6+\left(2-6x\right)\left(x+\frac{1}{2}\right)=1\)

\(\Leftrightarrow6x^2+13x+6+2x+1-6x^2-3x=1\)

\(\Leftrightarrow12x+7=1\)

\(\Leftrightarrow x=\frac{-1}{2}\)

2x( x - 4 ) - x( 2x + 3 ) + 22 = 0

<=> 2x² - 8x - 2x² - 3x + 22 = 0

<=> -11x + 22 = 0

<=> -11x = -22

<=> x = 2

( 2x + 3 )( 3x + 2 ) + 2( 1 - 3x )( x + 1/2 ) = 1

<=> 6x² + 13x + 6 + 2( -3x² - 1/2x + 1/2 ) = 1

<=> 6x² + 13x + 6 - 6x² - x + 1 = 1

<=> 12x + 7 = 1 

<=> 12x = -6

<=> x = -6/12 = -1/2

\(A=\left(x+y\right)^2+\left(x-y\right)^2-2\left(x^2y^2\right)\)

\(A=x^2+2xy+y^2+x^2-2xy+y^2-2x^2y^2\)

\(A=2x^2+2y^2-2x^2y^2\)

\(A=2\left(x^2-x^2y^2+y^2\right)\)

A = ( x + y )² + ( x - y )² - 2( x²y² )

A = x² + 2xy + y² + x² - 2xy + y² - 2x²y²

A = 2x² + 2y² - 2x²y²

A = 2( x² + y² - x²y² )

nhanh lên mình k cho

a) \(12^{10}:3^{10}=\left(12:3\right)^{10}=4^{10}\)

b) \(4^5.3^{10}=4^5.3^{2.5}=4^5.\left(3^2\right)^5=4^5.9^5=\left(4.9\right)^5=36^5\)

c) \(9^{10}:27^4=\left(3^2\right)^{10}:\left(3^3\right)^4=3^{2.10}:3^{3.4}=3^{20}:3^{12}=3^8\)

d) \(15^8:9^4=15^8:\left(3^2\right)^4=15^8:3^8=\left(15:3\right)^8=5^8\)

1.John's results were good.Fred's results were very poor.Fred's results were(bad)  worse than

2.This exercise is not difficult.It's (easy) easier than

3.The weather is not good today-it's raining.I hope the weather will be (good) better.

4.People are not friendly in big cities. They are usually(friendly) more friendly

5. In the government of a country, the President is ( important) the most important

15. John's  results were bad. Fred's results were very poor. Fred's results were worse.

16. This exercise is not difficult. It's easy.

17. The weather is not good today - It's raining. I hope the weather will be better.

18. People are not very friendly in big cities. They are usually unfriendly.

19. In the government of a country, the President is important.

1/2-(2/3×x-1/3)=2/3

(2/3×x-1/3)=1/2-1/3

(2/3×x-1/3)=1/6

2/3×x=1/6+1/3

2/3×x=1/2

x=1/2:2/3

x=3/4

vậy x=3/4

3/x+5=15%

3/x+5=3/20

3/x=3/20-5

3/x=-97/20

3×20=x×-97

60=x×-97

x×-97=60

x=60:-97

x=-60/97

vậy x=-60/97

Ta có:\(\frac{1}{2}-\left(\frac{2}{3}\times x-\frac{1}{3}\right)=\frac{2}{3}\Rightarrow\frac{2}{3}\times x-\frac{1}{3}=\frac{1}{2}-\frac{2}{3}\)

\(\Rightarrow\frac{2}{3}\times x-\frac{1}{3}=\frac{-1}{6}\)

\(\Rightarrow\frac{2}{3}\times x=\frac{-1}{6}+\frac{1}{3}\Rightarrow\frac{2}{3}\times x=\frac{1}{6}\Rightarrow x=\frac{1}{6}:\frac{2}{3}=\frac{1}{4}\)

Vậy x=1/4

Ta có:\(\frac{3}{x}+5=15\%\Rightarrow\frac{3}{x}=\frac{3}{20}-5\Rightarrow\frac{3}{x}=\frac{-97}{20}\Rightarrow x=\frac{3}{\frac{-97}{20}}=\frac{-60}{97}\)

Vậy x=-60/97