Question

-6(0,5х-1,5)-4,5x-8 , при х = 2/3

Answer 1

=3х+9-4,5х-8=-1,5х+1
=-3/2*2/3+1=-1+1=0

Answer 2

-6 (0,5x-1,5)-4,5х-8
расскрываем скобки
-3x+8-4,5х-8
сокращаем
-7,5x
подставляем значения х
-7.5×2/3=-75/10×2/3 = -150/30 = -5
Ответ : -5

Answer 3

To find the value of the expression -6(0.5x - 1.5) - 4.5x - 8 when x = 2/3, we substitute x = 2/3 into the expression and perform the calculations:

-6(0.5(2/3) - 1.5) - 4.5(2/3) - 8

First, let's simplify the expression inside the parentheses:

-6(1/3 - 1.5) - 4.5(2/3) - 8

Next, simplify the values inside the parentheses:

-6(-4/3) - (9/2) - 8

Now, simplify the expression inside the first set of parentheses:

24/3 - 9/2 - 8

Simplify further by finding a common denominator for the fractions:

8/1 - 27/2 - 16/2

Combine the fractions:

8 - 27/2 - 16/2

Multiply the whole number by the denominator to make it a fraction:

8/1 - 27/2 - 16/2

Now, find a common denominator:

8/1 - 27/2 - 16/2

Combine the fractions:

16/2 - 27/2 - 16/2

Subtract the fractions:

-27/2 - 16/2 = -43/2

Finally, combine the remaining fraction with the whole number:

8 - 43/2 = 16/2 - 43/2 = -27/2

Therefore, when x = 2/3, the expression -6(0.5x - 1.5) - 4.5x - 8 evaluates to -27/2.