Question

20x-(x-3)+3(3x-10) при x=Две третьих

Answer 1

Ответ:

-8 и 1/3

Объяснение 20x - x + 3 + 9x -30

28x -27, если x=2/3 то

28*2/3 -27=-8 и 1/3

Answer 2

To evaluate the expression 20x - (x-3) + 3(3x-10) when x = two-thirds, we'll substitute the value of x into the expression and then perform the calculations.

Given that x = two-thirds = 2/3, let's proceed with the evaluation:

20x - (x - 3) + 3(3x - 10)

Replace x with 2/3:

20(2/3) - ((2/3) - 3) + 3(3(2/3) - 10)

Now, let's simplify the expression step-by-step:

1. 20(2/3) = 40/3

2. (2/3) - 3 = (2/3) - (9/3) = -7/3

3. 3(2/3) = 2

4. 3(3(2/3) - 10) = 3(2 - 10) = 3(-8) = -24

Substitute these values back into the expression:

40/3 - (-7/3) + (-24)

Now, when you subtract a negative value, it is equivalent to adding the positive value:

40/3 + 7/3 - 24

Now, add the fractions:

(40 + 7)/3 - 24

47/3 - 24

To subtract fractions, they must have a common denominator:

(47 - 72)/3

Now, perform the subtraction:

-25/3

So, the value of the expression 20x - (x-3) + 3(3x-10) when x = two-thirds (2/3) is -25/3 or approximately -8.33.