Question

-4(2,5a-1,5)+5,5a -8 если a= -2/9

Answer 1

-4(2,5a-1,5)+5,5a -8 если a= -2/9
1) -4(2,5a-1,5)= -10a+6
2) -10a+6+5.5a-8= -4.5a-2
3) -4.5a-2=4.5*2/9-2=-1
Ответ= -1 

Answer 2

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

Answer 3

To solve the expression, we need to substitute the given value of "a" into the expression and perform the arithmetic operations according to the order of operations (PEMDAS):

PEMDAS: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).

So, substituting a = -2/9, we get:

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

First, we need to simplify the expression inside the parentheses:

2.5(-2/9) - 1.5 = -0.56

Substituting this value, we get:

-4(-0.56) + 5.5(-2/9) - 8

Now, we can simplify the multiplication and division:

-4(-0.56) = 2.24

5.5(-2/9) = -1.22

Substituting these values, we get:

2.24 - 1.22 - 8

Finally, we can simplify the addition and subtraction:

2.24 - 1.22 - 8 = -6.98

Therefore, the value of the expression when a = -2/9 is -6.98.