Question

4(2х-3у)-7(4х-5d),если х=0,2 ; у=0,6

Answer 1

4(2x-3y)-7(4x-5y) = 8x-12y-28x+35y = 23y-20x = 23•0.6 - 20•0.2 = 13,8-4 = 9,8

Answer 2

To find the value of the expression 4(2x - 3y) - 7(4x - 5d) when x = 0.2 and y = 0.6, simply substitute the given values into the expression and perform the calculations.

Let's first evaluate the expression for x = 0.2 and y = 0.6:

1. Substitute x = 0.2 and y = 0.6 into 4(2x - 3y): 4(2 * 0.2 - 3 * 0.6)

2. Simplify the expression inside the parentheses: 4(0.4 - 1.8)

3. Perform the subtraction: 4(-1.4)

4. Now, substitute x = 0.2 into 7(4x - 5d): 7(4 * 0.2 - 5 * d)

Note: The value of d is not given, so we cannot calculate the exact numerical result for this part of the expression.

Now, let's combine both parts of the expression:

4(2x - 3y) - 7(4x - 5d) = 4(-1.4) - 7(4 * 0.2 - 5 * d)

Since we don't have the value of d, we can't provide the final numerical answer. If the value of d is given, you can substitute it into the expression and calculate the final result.