Question

Значение выражения 5 (7а +9) -7 (5а - 9)равно при а, равнолюбому числу-110​

Answer 1

Ответ:

5(7*1+9)-7(5*1-9)

5*16-7*(-4)

80+28=108

Answer 2

To find the value of the expression 5(7a + 9) - 7(5a - 9) when a is equal to any number, let's substitute the value a = -110 into the expression and simplify it.

Replacing a with -110, we have:

5(7(-110) + 9) - 7(5(-110) - 9)

Simplifying inside the parentheses:

5(-770 + 9) - 7(-550 - 9)

Continuing to simplify:

5(-761) - 7(-559)

Multiplying:

-3,805 + 3,913

Calculating the sum:

-3,805 + 3,913 = 108

Therefore, when a is equal to any number, specifically -110 in this case, the value of the expression 5(7a + 9) - 7(5a - 9) is 108.