Question

1 1/9(3х-9)-2 1/3(х-1,8) при х=0,75

Answer 1

$1 \frac{1}{9} (3x - 9) - 2 \frac{1}{3} (x - 1.8) = \\ = \frac{10}{ 9} (3x - 9) - \frac{7}{3} (x - 1.8) = \\ = 3 \frac{1}{3} x - 10 - 2 \frac{1}{3} x + 4.2 = \\ = x - 4.8$
при х= 0.75

$x - 4.8 = 0.75 - 4.8 = \\ = - 4.05$
Ответ: - 4.05

Answer 2

To evaluate the expression, simply substitute the value of x with 0.75 and perform the calculations step by step:

1 1/9(3х - 9) - 2 1/3(х - 1.8) when х = 0.75

Step 1: Substitute x with 0.75 in each part of the expression: 1 1/9(3 * 0.75 - 9) - 2 1/3(0.75 - 1.8)

Step 2: Perform the calculations inside the parentheses: 1 1/9(2.25 - 9) - 2 1/3(-1.05)

Step 3: Continue with the calculations: 1 1/9(-6.75) - 2 1/3(-1.05)

Step 4: Simplify the fractions: -6.75/9 - 7/3(-1.05)

Step 5: Convert -6.75/9 to a mixed number: -0.75 - 7/3(-1.05)

Step 6: Multiply 7/3 by -1.05: -0.75 + 7 * -1.05 / 3

Step 7: Perform the multiplication: -0.75 - 7 * 1.05 / 3

Step 8: Multiply 7 by 1.05 and divide by 3: -0.75 - 7 * 1.05 = -0.75 - 7.35 = -8.1

The result of the expression when x = 0.75 is -8.1.