Rút gọn biểu thức sau
(2/2-√5 - 2/2+√5):√20

Answers

Answer 1

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let's solve for value of (2/2-√5 - 2/2+√5) :

[tex] \dfrac{2}{2 - \sqrt{5} } - \dfrac{2}{2 + \sqrt{5} } [/tex][tex] \dfrac{2(2 + \sqrt{5} ) - 2(2 - \sqrt{5} )}{ {2}^{2} - 5} [/tex][tex] \dfrac{4 + 2 \sqrt{5} - 4 + 2 \sqrt{5} }{4 - 5}[/tex][tex] \dfrac{4 \sqrt{5} }{ - 1} [/tex][tex] - 4 \sqrt{5} [/tex]

now, let's simply the ratio :

[tex] - 4 \sqrt{5} : \sqrt{20} [/tex][tex] \dfrac{ - 4 \sqrt{5} }{ \sqrt{20} } [/tex][tex] \dfrac{ - 4}{ \sqrt{4} } [/tex][tex] - \sqrt{4} [/tex]

Therfore , the required ratio is :

[tex] - \sqrt{4} :1[/tex]


Related Questions

ASAP please thank you

Answers

Step-by-step explanation:

that is really totally easy :

to get the value of the nth term, you just need to put the actual number instead of n in the calculation rule and calculate !

the 1st term :

3×1 + 2 = 3 + 2 = 5

the 2nd term :

3×2 + 2 = 6 + 2 = 8

the 3rd term :

3×3 + 2 = 9 + 2 = 11

the 10th term :

3×10 + 2 = 30 + 2 = 32

What is the coupon rate and maturity date for this bond ?

Answers

Answer:

I don't know the answer! this is hard

Step-by-step explanation:

Answer:

need help

Step-by-step explanation:

5 of 12
© Work out the percentage change when a price of £10 is increased to £12.
1
Support companies
Hegarty Maus Privacy NOUCE
hegartymaths

Answers

Percent change = (New-Old)/Old x 100%
(12-10)/10 x 100% = 20%
ANSWER: 20% change (increase)

How to check 20p+15=35p+30? really need help help

Answers

Answer:

p= -1.5 ( i dont know if this is what you were asking but)

Step-by-step explanation:

20p+15=35p+30

-15                  -15

20p=35p+15

-35p  -35p

-10p=15

/-10   /-10

p= -1.5

Slope =1/4; (8,3) is on the line

Answers

Answer:

y = (1/4)x + 1

Step-by-step explanation:

yeah-ya ....... right?

Which gases are needed for animal and plant respiration? Select two options. FAST ITS TIMED
oxygen
nitrogen
carbon dioxide
neon
carbon

Answers

Answer:

It oxygen. hope this'll help. All the best.

Oxygen and carbon dioxide

I really need help with this it’s due tonight

Answers

The upside down t means perpendicular meaning they hit at a 90° angle and the two lines mean parallel mean the are perfectly straight to each other and never hit each other, by looking at you graph I would say b and c are correct while a and d are not

What is the length of AB?

Answers

Answer:

10

Step-by-step explanation:

it is the 3,4,5 triangle times two in lengths

I need an explanation on how to do this

Answers

Answer:i

Step-by-step explanation:

Skkslalsowkkskwoskskwoskkwmejekdjdjxjdmemejje

Can someone plsss help ? thank you :)

Answers

Answer:

area of trapezium =1/2(a+b)*h

=1/2(7+10.4)*6.7

=1/2(17.4)*6.7

=1/2(116.58)

=116.58/2

=58.29 square cm

Answer:

58.29 cm²

Step-by-step explanation:

Hi there!

Area of a trapezoid: [tex]A=\displaystyle \frac{a+b}{2} *h[/tex]

We're given that a = 7, b = 10.4 and h = 6.7. Plug these into the above:

[tex]A=\displaystyle \frac{7+10.4}{2} *6.7\\\\A=\displaystyle \frac{17.4}{2} *6.7\\A=8.7*6.7\\A=58.29[/tex]

Therefore, the area of the trapezoid is 58.29 cm².

I hope this helps!

PLEASE HELP ME
I don't know how to solve this​

Answers

Answer:

y = 77 degrees

Step-by-step explanation:

180 = 4x + 29 + 9x - 5

180 = 13x + 24

156 = 13x

x = 12

4x + 29 = y

48 + 29 = y

y = 77 degrees

Channing earns $12.60 per hours at his job. During one week , he worked a total of 26 1/2 hours . He deposited 280.00 in the bank and decided to use the rest if his money to buy shirts for work . If each shirt coats 8.60 what is the amount of shirts canning can buy ?

Answers

Answer:

he can get 6 shirts

Step-by-step explanation:

12.60 x 26.5

333.9 - 280

53.9 ÷ 8.6

6

Answer:

6

Step-by-step explanation:

Which equation has no solution?
Group of answer choices

the absolute value of 2 x minus 1 equals 0

the absolute value of 5 minus 3 x equals negative 8

the absolute value of negative x minus 3 equals 5

the absolute value of negative x plus 9 equals 0

Answers

Answer:

B. the absolute value of 5 minus 3 x equals negative 8

Step-by-step explanation:

The absolute value is never negative as per definition.

A. |2x - 1| = 0, has solutionB. |5 - 3x| = - 8, no solutionC. |-x - 3| = 5, has solutionD. |-x + 9| = 0, has solution

Correct choice is B

Given :-

the absolute value of 2 x minus 1 equals 0the absolute value of 5 minus 3 x equals negative 8the absolute value of negative x minus 3 equals 5the absolute value of negative x plus 9 equals 0

To find :-

Which of the equation has no solution .

Answer :-

Convert the given statement from word form to mathematical form ,

| 2x - 1| = 0 | 5 - 3x | = -8 | -x-3 | = 5 | - x + 9| = 9

As we know that the modulus function always gives positive values . So from the given options we can see that |5-3x| = -8 , which is not possible .

Hence | 5-3x | = -8 has no solutions .

given that f(x) = 3x - 4 complete the table below

Answers

Answer:

if x = -2, y = -10

if x = 0, y = -4

if y = -1, x = 1

Step-by-step explanation:

if x = -2:

f(-2) = 3(-2) - 4

f(-2) = -6 - 4

f(-2) = -10

if x = 0:

f(0) = 3(0) - 4

f(0) = 0 - 4

f(0) = -4

if y = -1

-1 = 3(x) - 4

3 = 3(x)

x = 1

-Chetan K

if a domain is "all real numbers" can it be a function?

Answers

Hello!

Answer:

Yes

Step-by-step explanation:

Functions assign outputs to inputs. For example, the domain of f(x)=x² is all real numbers, and the domain of g(x)=1/x is all real numbers except for x=0. We can also define special functions whose domains are more limited.

Hope this helps!

Answer:

Yeah

Step-by-step explanation:

you know real numbers are the combination of. the rational and irrational number so they domain over all other functions

$18.00 breakfast: 7% tax

Answers

Answer:

$19.26

Step-by-step explanation:

I worked in a bank for a year.

What is the solution to the system of equations shown in the graph? -2,0 2,2 0,-2, 1,0

Answers

Answer:

B

Step-by-step explanation:

find the sum of the greatest and the smallest numbers of five digits fromed by the digits 3,0,7,5 and 2

Answers

Answer:

The correct answer is 95,677

Step-by-step explanation:

Greatest number of five digits: 75,320

Smallest number of five digits: 20,357

--

Remember:

Sum = Addition

Product = Multiplication

Difference = Subtraction

Sum of Greatest & Smallest:

[tex]75,320 + 20,357 = n[/tex]

[tex]n = 95,677[/tex]

Therefore, the correct answer is 95,677

The greatest number in the digits is 7, the smallest is 0.Their sum will be: 7+0=7

=7

Term

Coef

SE Coef

T-value

P-Value

Constant

10834

9716

1.12

0.274

Wins

235

119

1.98

0.058

S - 7,377

R

sq - 12.29%

Adj R sq -9.16%

The scatterplot above shows the number of wins and the attendance per game for 30 baseball teams in 2017.

Also shown are the least-squares regression line and computer output.

a) Using the information above, what is the equation of the least-squares regression line?

b) What is the value of the correlation coefficient for the sample?

c) Interpret the slope of the least-squares regression line in context.

Answers

The computer regression output includes the R-squared values, and adjusted R-squared values as well as other important values

a) The equation of the least-squares regression line is [tex]\underline {\hat y = 235 \cdot x + 10835}[/tex]

b) The correlation coefficient for the sample is approximately 0.351

c) The slope gives the increase in the attendance per increase in wins

Reasons:

a) From the computer regression output, we have;

The y-intercept and the slope are given in the Coef column

The y-intercept = 10835

The slope = 235

The equation of the least-squares regression line is therefore

[tex]\underline {\hat y = 235 \cdot x + 10835}[/tex]

b) The square of the correlation coefficient, is given in the table as R-sq = 12.29% = 0.1229

Therefore, the correlation coefficient, r = √(0.1229) ≈ 0.351

The correlation coefficient for the sample, r ≈ 0.351

c) The slope of the least squares regression line indicates that as the number of attending increases by 235 for each increase in wins

Learn more here:

https://brainly.com/question/2456202

If y=32 then 86y+25-78y=

Answers

Answer:

281

Step-by-step explanation:

[tex]86(32) + 25 - 78(32)[/tex] [tex]2752 + 25 - 78(32)[/tex] [tex]2777 - 78(32)[/tex] [tex]2777 - 2496[/tex] [tex]281[/tex]

Therefore, the answer is 281.

Perform the indicated operation. Be sure the answer is reduced.
x+1/x-8 - x/8-x =

Answers

Answer:

the second option

Step-by-step explanation:

ILL GIVE BRAINLIEST!!! Please expand this equation.

Answers

Answer:

fx = x^4 - 7x^3 + 7x^2 + 21x - 30

the symbol ^ means the power of.

Given that the total distance travelled = 810m find a) the value of V

Answers

Answer:

a

Step-by-step explanation:

Help me plzzzzzzzzzzzz

Answers

Answer:

D. x = 5 or x = 10

Step-by-step explanation:

2) <3 and <4 are complementary angles. If m<23 = (x + 24)° and m<4 =(x)º, then
find the measures of these angles.

Answers

Answer:

angle 3: 57; angle 4: 33

Step-by-step explanation:

because they are complementary angles they add up to 90 so we set the equation up like this

x + 24 + x = 90

after combining like terms and subtracting 24 from each side you get this

2x = 66

when you simply you get this

x = 33

angle 3 is 57 when we add and angle 4 is 33

1. A triangle is rotated 35° about the origin. What is true about the relationship be pre-image?

Answers

Answer:

the triangles are equivalent

Step-by-step explanation:

that's it

what is 1+2+3+4+5+6+7+8+9+10=???

Answers

55 is the answer to that

Devin has $24.50 in his bank account and then he buys a bike for $62.75 on his credit card. a) Write an expression showing his purchase. b) Does he still have money remaining or is he in debt?

Answers

Answer : $5
Because: y=mc+b

How to find a base of a something without area

PLEASE HELP ME

Answers

Answer:  Measure the length of the base. Call this value "b." Substitute these values into the equation for the area of a triangle: area = 1/2bh

Step-by-step explanation:

In geometry, the bottom of a three-dimensional object is called a base – if the top of the solid is parallel to the bottom it is also called a base. Since bases occupy a single plane, they have only two dimensions. You can find the area of a base by using the formula for the area of that shape.

phineas has 3 times as many baseball cards as ferb.together,they have a total of 228 baseball cards.how many baseball cards does ferb have?

Answers

i think its ctuallly76

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