Question

-4(2,5a-1,5)+5,5a-8 если a=-2дробь9

Answer 1

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

Answer 2

-4,5а-2=-4,5*(-2/9)-2=-45/10*(-2/9)-2=90/90-2=1-2=-1

Answer 3

To evaluate the expression -4(2.5a - 1.5) + 5.5a - 8 when a = -2/9, we first need to substitute -2/9 in place of every occurrence of the variable a in the expression.

So, we have:

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

Simplifying the expression inside the square brackets first, we get:

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

-4[(-8/9)] - 71/9

32/9 - 71/9

-39/9

Simplifying the expression further, we can reduce the fraction by dividing both the numerator and denominator by their greatest common factor, which is 3:

-39/9 = (-133)/(33) = -13/3

Therefore, when a = -2/9, the value of the expression -4(2.5a - 1.5) + 5.5a - 8 is -13/3.