Question

3×(4а-5)+2(1-а)-(-5а+2) при а=-3

Answer 1

Смотри решение на фото.

Answer 2

To find the value of the expression 3×(4a-5)+2(1-a)-(-5a+2) when a is equal to -3, we can substitute -3 for a in the expression and simplify the arithmetic.

Let's start by substituting -3 for a in the expression: 3×(4(-3)-5)+2(1-(-3))-(-5(-3)+2)

Now, let's simplify the expression step by step:

Step 1: Simplify the terms inside the parentheses. 3×(12-5)+2(1+3)-(-15+2)

Step 2: Perform the multiplication inside the parentheses. 3×7+2×4-(-13)

Step 3: Simplify the multiplications. 21+8-(-13)

Step 4: Simplify the subtraction. 21+8+13

Step 5: Perform the addition. 42

Therefore, when a is equal to -3, the value of the expression 3×(4a-5)+2(1-a)-(-5a+2) is 42.