Question

1 1/9(3x-9)-2 1/3(x-1,8) при х 0,75

Answer 1

1  1/9 (3 х - 9) - 2 1/3 (х - 1,8) = 10/9 (2,25 - 9) - 7/3 (0,75 - 1,8) = 10/9 (-6,75) -
7/3 (-1,05) = 10/9 (-675/100) - 7/3 (-105/100) = (-75/10) + (245/100) =
-7,5 +2,45 = -5,05

Answer 2

To evaluate the expression when x = 0.75, we'll substitute the value of x into the given expression:

1 1/9(3x - 9) - 2 1/3(x - 1.8)

Let's first simplify the expression step-by-step:

1. Substitute x = 0.75 into (3x - 9): 3 * 0.75 - 9 = 2.25 - 9 = -6.75

2. Substitute x = 0.75 into (x - 1.8): 0.75 - 1.8 = -1.05

3. Now, rewrite the expression with the above substitutions: 1 1/9(-6.75) - 2 1/3(-1.05)

4. Simplify the fractions: 1 1/9(-6.75) = -6.75 + 1/9 = -6.75 + 0.1111... ≈ -6.6389... 2 1/3(-1.05) = -1.05 + 2/3 = -1.05 + 0.6666... ≈ -0.3833...

5. Combine the results: -6.6389... - (-0.3833...) ≈ -6.2556...

Therefore, when x = 0.75, the expression 1 1/9(3x - 9) - 2 1/3(x - 1.8) is approximately equal to -6.2556.