Question

Упростите:13а-4(3а-1) и найдите его значение при а=2.5

Answer 1

13а-4(3а-1) при а=2.5
13а-4(3а-1)=13а-12а+4=а+4
2,5+4=6,5

Answer 2

To simplify the expression 13a - 4(3a - 1), follow the distributive property, which states that you should distribute the -4 across the terms inside the parentheses:

13a - 4(3a - 1) = 13a - 4 * 3a + 4 * 1

Now, perform the multiplication:

= 13a - 12a + 4

Combine like terms:

= (13a - 12a) + 4

= a + 4

Now, to find the value of the expression when a = 2.5, simply substitute a with 2.5:

Expression = 2.5 + 4

Expression = 6.5

So, when a = 2.5, the value of the expression is 6.5.