Question

-4 (2,5а - 1,5) + 5,5а – 8, при а = -2/9

Answer 1

=-10а+6+5,5а-8=-4,5а-2 -4,5*2/9-2=-9/2*2/9-2=-1-2=-3

Answer 2

To evaluate the expression, substitute the value of "a" into the given expression and then perform the calculations step by step:

Given expression: -4(2.5a - 1.5) + 5.5a - 8

a = -2/9

Step 1: Substitute the value of "a" into the expression.

-4(2.5(-2/9) - 1.5) + 5.5(-2/9) - 8

Step 2: Simplify the expression within the parentheses.

-4(-5/9 - 1.5) + (-11/9) - 8

Step 3: Simplify further.

-4(-5/9 - 9/6) - (99/9) - 8

Step 4: Convert fractions to a common denominator.

-4(-10/18 - 27/18) - (99/9) - 8

Step 5: Combine the fractions inside the parentheses.

-4(-37/18) - (99/9) - 8

Step 6: Multiply.

74/18 - 99/9 - 8

Step 7: Convert fractions to a common denominator.

74/18 - 198/18 - 8

Step 8: Combine the fractions.

(74 - 198)/18 - 8

Step 9: Perform the subtraction.

-124/18 - 8

Step 10: Convert the improper fraction to a mixed number.

-6 10/18 - 8

Step 11: Simplify the mixed number.

-6 5/9

So, the value of the expression when a = -2/9 is -6 5/9.