Question

-3a-(8b-15a),если 3a-2b=0,25

Answer 1

-3a-8b+15a
12a-8b
4(3a-2b)
4x0.25=1
Ответ: 1

Answer 2

To simplify the expression -3a - (8b - 15a), we can use the given information that 3a - 2b = 0.25.

Step 1: Distribute the negative sign to the terms inside the parentheses: -3a - 8b + 15a

Step 2: Combine like terms (terms with the same variable): (15a - 3a) - 8b

Step 3: Simplify the coefficients: 12a - 8b

Now, to find the value of the expression 12a - 8b, we need to find the values of 'a' and 'b' using the given equation 3a - 2b = 0.25.

Given: 3a - 2b = 0.25

Step 4: Isolate 'b' in terms of 'a': 3a - 0.25 = 2b 2b = 3a - 0.25 b = (3a - 0.25) / 2

Step 5: Substitute the expression for 'b' in terms of 'a' into the expression 12a - 8b: 12a - 8((3a - 0.25) / 2)

Step 6: Simplify further: 12a - 4(3a - 0.25)

Step 7: Distribute the 4: 12a - 12a + 1

Step 8: Combine like terms: 1

So, the simplified expression for -3a - (8b - 15a) when 3a - 2b = 0.25 is simply 1.