Question

Упроститет выражение 1+2a-(6-5a)+(5-3a) и вычислите его значение при a=-3/4

Answer 1

1+2a-6+5a+5-3a= 4a+0= -3/4*4= -3

Answer 2

To simplify the expression 1 + 2a - (6 - 5a) + (5 - 3a) and evaluate it for a = -3/4, follow these steps:

Step 1: Distribute the negative sign inside the second parentheses: 1 + 2a - 6 + 5a + 5 - 3a

Step 2: Combine like terms (terms with the same variable, i.e., 'a'): (2a + 5a - 3a) + (1 - 6 + 5)

Step 3: Simplify the terms with 'a': (4a) + (0)

Step 4: Simplify the constant terms: 4a

Now, we need to evaluate this expression for a = -3/4:

Substitute a = -3/4 into the expression: 4 * (-3/4)

The 'a' terms cancel out, and we are left with:

4 * (-3/4) = -3

So, the simplified expression for 1 + 2a - (6 - 5a) + (5 - 3a) is 4a, and its value when a = -3/4 is -3.