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Korvikt [17]
3 years ago
13

Cao nhân giải hộ với ngu toán quá

Mathematics
1 answer:
aleksandrvk [35]3 years ago
8 0
2 + 10 +7+76+5 = 3927
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The sum of three numbers is 26. Twice the first minus the second is the third less 2. The third is the second minus 3 times the
Agata [3.3K]

Let a, b, c represent the three numbers. The problem statement gives rise to three equations:

  • a +b +c = 26
  • 2a -b = c -2
  • -3a +b = c

Adding the first two equations gives

... (a +b +c) +(2a -b) = (26) +(c -2)

... 3a +c = 24 +c . . . . . simplify

... 3a = 24 . . . . . . . . . . subtract c

... a = 8 . . . . . . . . . . . . divide by 3

Adding the second and third equations gives ...

... (2a -b) +(-3a +b) = (c -2) +(c)

... -a = 2c -2 . . . . simplify

... -6 = 2c . . . . . . add 2, substitute for a

... -3 = c . . . . . . . . divide by 2

Using the third equation we can find b.

... -3·8 +b = -3 . . . . substitute for a and c

... b = 21 . . . . . . . . .add 24

The numbers are 8, 21, -3.

_____

The method above is sort of "ad hoc", taking advantage of the numbers in this particular set of equations. You can use more formal methods of Gaussian elimination or Cramer's Rule to solve these by just following a procedure. Or, your graphing calculator can do it for you.

6 0
3 years ago
Help... need it right now ;-;
zalisa [80]

Answer:

1

Step-by-step explanation:

|3 + 2 - 6| = |5 - 6| = |-1| = 1

3 0
3 years ago
Read 2 more answers
I need help plss its hard for me pls help and show the WORK plsss
My name is Ann [436]
Is there a picture of the question?
8 0
2 years ago
10 pts<br> Point K (-2,-3) is translated (x + 5, y-7). What are the coordinates K?
Nady [450]
The answer is (3,-10)
4 0
3 years ago
Read 2 more answers
Given the following formula, solve for t. v=u+at
sergeinik [125]

Answer:

<h2>t = \frac{v - u}{a}</h2>

Step-by-step explanation:

v = u + at

To solve for t move u to the left side of the equation

That's

at = v - u

Divide both sides by a in order to make t stand alone

We have

<h3>\frac{at}{a}  =  \frac{v - u}{a}</h3>

We have the final answer as

<h3>t = \frac{v - u}{a}</h3>

Hope this helps and

5 0
3 years ago
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